diff --git a/charts/gha-runner-scale-set-experimental/templates/_helpers.tpl b/charts/gha-runner-scale-set-experimental/templates/_helpers.tpl
index abfaccca..4a4b8c29 100644
--- a/charts/gha-runner-scale-set-experimental/templates/_helpers.tpl
+++ b/charts/gha-runner-scale-set-experimental/templates/_helpers.tpl
@@ -69,3 +69,116 @@ Takes a map of user labels and removes the ones with "actions.github.com/" prefi
 {{- end }}
 
 
+{{/*
+GitHub Server TLS helper parts
+
+These helpers centralize TLS env/volumeMount/volume snippets so that runner modes
+inject the certificate consistently.
+
+Behavior:
+- If githubServerTLS.runnerMountPath is empty: emit nothing.
+- If runnerMountPath is set: require certificateFrom.configMapKeyRef.name + key.
+- Avoid duplicating user-provided env vars / volumeMounts.
+*/}}
+
+{{- define "githubServerTLS.config" -}}
+{{- $tls := (default (dict) .Values.githubServerTLS) -}}
+{{- if and (not (empty $tls)) (not (kindIs "map" $tls)) -}}
+  {{- fail "githubServerTLS must be a map/object" -}}
+{{- end -}}
+{{- toYaml $tls -}}
+{{- end -}}
+
+{{- define "githubServerTLS.mountPath" -}}
+{{- $tls := (include "githubServerTLS.config" .) | fromYaml -}}
+{{- (index $tls "runnerMountPath" | default "") -}}
+{{- end -}}
+
+{{- define "githubServerTLS.configMapName" -}}
+{{- $mountPath := include "githubServerTLS.mountPath" . -}}
+{{- if not (empty $mountPath) -}}
+{{- $tls := (include "githubServerTLS.config" .) | fromYaml -}}
+{{- required "githubServerTLS.certificateFrom.configMapKeyRef.name is required when githubServerTLS.runnerMountPath is set" (dig "certificateFrom" "configMapKeyRef" "name" "" $tls) -}}
+{{- end -}}
+{{- end -}}
+
+{{- define "githubServerTLS.certKey" -}}
+{{- $mountPath := include "githubServerTLS.mountPath" . -}}
+{{- if not (empty $mountPath) -}}
+{{- $tls := (include "githubServerTLS.config" .) | fromYaml -}}
+{{- required "githubServerTLS.certificateFrom.configMapKeyRef.key is required when githubServerTLS.runnerMountPath is set" (dig "certificateFrom" "configMapKeyRef" "key" "" $tls) -}}
+{{- end -}}
+{{- end -}}
+
+{{- define "githubServerTLS.certFilePath" -}}
+{{- $mountPath := include "githubServerTLS.mountPath" . -}}
+{{- if not (empty $mountPath) -}}
+{{- $key := include "githubServerTLS.certKey" . -}}
+{{- printf "%s/%s" (trimSuffix "/" $mountPath) $key -}}
+{{- end -}}
+{{- end -}}
+
+{{- define "githubServerTLS.envItems" -}}
+{{- $root := .root -}}
+{{- $mountPath := include "githubServerTLS.mountPath" $root -}}
+{{- if not (empty $mountPath) -}}
+{{- $existing := (.existingEnv | default list) -}}
+{{- $hasNodeExtra := false -}}
+{{- $hasRunnerUpdate := false -}}
+{{- if kindIs "slice" $existing -}}
+  {{- range $existing -}}
+    {{- if and (kindIs "map" .) (eq ((index . "name") | default "") "NODE_EXTRA_CA_CERTS") -}}
+      {{- $hasNodeExtra = true -}}
+    {{- end -}}
+    {{- if and (kindIs "map" .) (eq ((index . "name") | default "") "RUNNER_UPDATE_CA_CERTS") -}}
+      {{- $hasRunnerUpdate = true -}}
+    {{- end -}}
+  {{- end -}}
+{{- end -}}
+{{- if not $hasNodeExtra -}}
+- name: NODE_EXTRA_CA_CERTS
+  value: {{ include "githubServerTLS.certFilePath" $root | quote }}
+{{ end }}
+{{- if not $hasRunnerUpdate -}}
+- name: RUNNER_UPDATE_CA_CERTS
+  value: "1"
+{{ end }}
+{{- end -}}
+{{- end -}}
+
+{{- define "githubServerTLS.volumeMountItem" -}}
+{{- $root := .root -}}
+{{- $mountPath := include "githubServerTLS.mountPath" $root -}}
+{{- if not (empty $mountPath) -}}
+{{- $existing := (.existingVolumeMounts | default list) -}}
+{{- $hasMount := false -}}
+{{- if kindIs "slice" $existing -}}
+  {{- range $existing -}}
+    {{- if and (kindIs "map" .) (eq ((index . "name") | default "") "github-server-tls-cert") -}}
+      {{- $hasMount = true -}}
+    {{- end -}}
+  {{- end -}}
+{{- end -}}
+{{- if not $hasMount -}}
+- name: github-server-tls-cert
+  mountPath: {{ $mountPath | quote }}
+  readOnly: true
+{{ end }}
+{{- end -}}
+{{- end -}}
+
+{{- define "githubServerTLS.podVolumeItem" -}}
+{{- $mountPath := include "githubServerTLS.mountPath" . -}}
+{{- if not (empty $mountPath) -}}
+{{- $cmName := include "githubServerTLS.configMapName" . -}}
+{{- $key := include "githubServerTLS.certKey" . -}}
+- name: github-server-tls-cert
+  configMap:
+    name: {{ $cmName | quote }}
+    items:
+      - key: {{ $key | quote }}
+        path: {{ $key | quote }}
+{{ end }}
+{{ end }}
+
+
diff --git a/charts/gha-runner-scale-set-experimental/templates/_mode_dind.tpl b/charts/gha-runner-scale-set-experimental/templates/_mode_dind.tpl
index e58a134b..fbb66622 100644
--- a/charts/gha-runner-scale-set-experimental/templates/_mode_dind.tpl
+++ b/charts/gha-runner-scale-set-experimental/templates/_mode_dind.tpl
@@ -1,10 +1,4 @@
 {{- define "runner-mode-dind.runner-container" -}}
-{{- $tlsConfig := (default (dict) .Values.githubServerTLS) -}}
-{{- $tlsMountPath := (index $tlsConfig "runnerMountPath" | default "") -}}
-{{- $tlsCertKey := "" -}}
-{{- if $tlsMountPath -}}
-  {{- $tlsCertKey = required "githubServerTLS.certificateFrom.configMapKeyRef.key is required when githubServerTLS.runnerMountPath is set" (index $tlsConfig "certificateFrom" "configMapKeyRef" "key") -}}
-{{- end -}}
 name: runner
 image: {{ include "runner.image" . | quote }}
 command: {{ include "runner.command" . }}
@@ -15,22 +9,13 @@ env:
   {{- with .Values.runner.env }}
     {{- toYaml . | nindent 2 }}
   {{- end }}
-  {{- if $tlsMountPath }}
-  - name: NODE_EXTRA_CA_CERTS
-    value: {{ printf "%s/%s" (trimSuffix "/" $tlsMountPath) $tlsCertKey | quote }}
-  - name: RUNNER_UPDATE_CA_CERTS
-    value: "1"
-  {{- end }}
+  {{ include "githubServerTLS.envItems" (dict "root" $ "existingEnv" (.Values.runner.env | default list)) | nindent 2 }}
 volumeMounts:
   - name: work
     mountPath: /home/runner/_work
   - name: dind-sock
     mountPath: {{ include "runner-mode-dind.sock-mount-dir" . | quote }}
-  {{- if $tlsMountPath }}
-  - name: github-server-tls-cert
-    mountPath: {{ $tlsMountPath | quote }}
-    readOnly: true
-  {{- end }}
+  {{ include "githubServerTLS.volumeMountItem" (dict "root" $ "existingVolumeMounts" (list)) | nindent 2 }}
 {{- end }}
 
 {{- define "runner-mode-dind.dind-container" -}}
@@ -63,26 +48,11 @@ volumeMounts:
 {{- end }}
 
 {{- define "runner-mode-dind.pod-volumes" -}}
-{{- $tlsConfig := (default (dict) .Values.githubServerTLS) -}}
-{{- $tlsMountPath := (index $tlsConfig "runnerMountPath" | default "") -}}
-{{- $tlsCMName := "" -}}
-{{- $tlsCertKey := "" -}}
-{{- if $tlsMountPath -}}
-  {{- $tlsCMName = required "githubServerTLS.certificateFrom.configMapKeyRef.name is required when githubServerTLS.runnerMountPath is set" (index $tlsConfig "certificateFrom" "configMapKeyRef" "name") -}}
-  {{- $tlsCertKey = required "githubServerTLS.certificateFrom.configMapKeyRef.key is required when githubServerTLS.runnerMountPath is set" (index $tlsConfig "certificateFrom" "configMapKeyRef" "key") -}}
-{{- end -}}
 - name: work
   emptyDir: {}
 - name: dind-sock
   emptyDir: {}
-{{- if $tlsMountPath }}
-- name: github-server-tls-cert
-  configMap:
-    name: {{ $tlsCMName | quote }}
-    items:
-      - key: {{ $tlsCertKey | quote }}
-        path: {{ $tlsCertKey | quote }}
-{{- end }}
+{{ include "githubServerTLS.podVolumeItem" . }}
 {{- if .Values.runner.dind.copyExternals }}
 - name: dind-externals
   emptyDir: {}
diff --git a/charts/gha-runner-scale-set-experimental/templates/_mode_empty.tpl b/charts/gha-runner-scale-set-experimental/templates/_mode_empty.tpl
index b8408b24..e1a720a3 100644
--- a/charts/gha-runner-scale-set-experimental/templates/_mode_empty.tpl
+++ b/charts/gha-runner-scale-set-experimental/templates/_mode_empty.tpl
@@ -5,73 +5,29 @@ Container spec that is expanded for the runner container
 {{- if not .Values.runner.container }}
   {{ fail "You must provide a runner container specification in values.runner.container" }}
 {{- end }}
-{{- $tlsConfig := (default (dict) .Values.githubServerTLS) -}}
-{{- $tlsMountPath := (index $tlsConfig "runnerMountPath" | default "") -}}
-{{- $tlsCertKey := "" -}}
-{{- if $tlsMountPath -}}
-  {{- $tlsCertKey = required "githubServerTLS.certificateFrom.configMapKeyRef.key is required when githubServerTLS.runnerMountPath is set" (index $tlsConfig "certificateFrom" "configMapKeyRef" "key") -}}
-{{- end -}}
 name: runner
 image: {{ .Values.runner.container.image | default "ghcr.io/actions/runner:latest" }}
 command: {{ toJson (default (list "/home/runner/run.sh") .Values.runner.container.command) }}
 
-{{/* Merge/add TLS env vars without duplicating user-defined ones */}}
-{{ $setNodeExtraCaCerts := false }}
-{{ $setRunnerUpdateCaCerts := false }}
-{{ if $tlsMountPath }}
-  {{ $setNodeExtraCaCerts = true }}
-  {{ $setRunnerUpdateCaCerts = true }}
-  {{ with .Values.runner.container.env }}
-    {{ range . }}
-      {{ if and (kindIs "map" .) (eq ((index . "name") | default "") "NODE_EXTRA_CA_CERTS") }}
-        {{ $setNodeExtraCaCerts = false }}
-      {{ end }}
-      {{ if and (kindIs "map" .) (eq ((index . "name") | default "") "RUNNER_UPDATE_CA_CERTS") }}
-        {{ $setRunnerUpdateCaCerts = false }}
-      {{ end }}
-    {{ end }}
-  {{ end }}
-{{ end }}
-{{ if or .Values.runner.container.env $setNodeExtraCaCerts $setRunnerUpdateCaCerts }}
+{{ $tlsEnvItems := include "githubServerTLS.envItems" (dict "root" $ "existingEnv" (.Values.runner.container.env | default list)) }}
+{{ if or .Values.runner.container.env $tlsEnvItems }}
 env:
   {{- with .Values.runner.container.env }}
   {{- toYaml . | nindent 2 }}
   {{- end }}
-  {{- if $setNodeExtraCaCerts }}
-  - name: NODE_EXTRA_CA_CERTS
-    value: {{ printf "%s/%s" (trimSuffix "/" $tlsMountPath) $tlsCertKey | quote }}
-  {{- end }}
-  {{- if $setRunnerUpdateCaCerts }}
-  - name: RUNNER_UPDATE_CA_CERTS
-    value: "1"
-  {{- end }}
+{{ $tlsEnvItems | nindent 2 }}
 {{ end }}
 
-{{/* Merge/add TLS volumeMount without duplicating user-defined ones */}}
-{{ $setTLSVolumeMount := false }}
-{{ if $tlsMountPath }}
-  {{ $setTLSVolumeMount = true }}
-  {{ with .Values.runner.container.volumeMounts }}
-    {{ range . }}
-      {{ if and (kindIs "map" .) (eq ((index . "name") | default "") "github-server-tls-cert") }}
-        {{ $setTLSVolumeMount = false }}
-      {{ end }}
-    {{ end }}
-  {{ end }}
-{{ end }}
-{{ if or .Values.runner.container.volumeMounts $setTLSVolumeMount }}
+{{ $tlsVolumeMountItem := include "githubServerTLS.volumeMountItem" (dict "root" $ "existingVolumeMounts" (.Values.runner.container.volumeMounts | default list)) }}
+{{ if or .Values.runner.container.volumeMounts $tlsVolumeMountItem }}
 volumeMounts:
   {{- with .Values.runner.container.volumeMounts }}
   {{- toYaml . | nindent 2 }}
   {{- end }}
-  {{- if $setTLSVolumeMount }}
-  - name: github-server-tls-cert
-    mountPath: {{ $tlsMountPath | quote }}
-    readOnly: true
-  {{- end }}
+{{ $tlsVolumeMountItem | nindent 2 }}
 {{ end }}
 
-{{ $extra := omit .Values.runner.container "name" "image" "command" "env" "volumeMounts" -}}
+{{ $extra := omit .Values.runner.container "name" "image" "command" "env" "volumeMounts" }}
 {{- if not (empty $extra) -}}
 {{ toYaml $extra }}
 {{- end -}}
diff --git a/charts/gha-runner-scale-set-experimental/templates/_mode_kubernetes.tpl b/charts/gha-runner-scale-set-experimental/templates/_mode_kubernetes.tpl
index 294aee09..38d8bfa8 100644
--- a/charts/gha-runner-scale-set-experimental/templates/_mode_kubernetes.tpl
+++ b/charts/gha-runner-scale-set-experimental/templates/_mode_kubernetes.tpl
@@ -1,12 +1,6 @@
 {{- define "runner-mode-kubernetes.runner-container" -}}
 {{- $runner := (.Values.runner | default dict) -}}
 {{- $kubeMode := (index $runner "kubernetesMode" | default dict) -}}
-{{- $tlsConfig := (default (dict) .Values.githubServerTLS) -}}
-{{- $tlsMountPath := (index $tlsConfig "runnerMountPath" | default "") -}}
-{{- $tlsCertKey := "" -}}
-{{- if $tlsMountPath -}}
-  {{- $tlsCertKey = required "githubServerTLS.certificateFrom.configMapKeyRef.key is required when githubServerTLS.runnerMountPath is set" (index $tlsConfig "certificateFrom" "configMapKeyRef" "key") -}}
-{{- end -}}
 {{- $hookPath := (index $kubeMode "hookPath" | default "/home/runner/k8s/index.js") -}}
 {{- $extensionRef := (index $kubeMode "extensionRef" | default "") -}}
 {{- $extension := (index $kubeMode "extension" | default dict) -}}
@@ -58,23 +52,7 @@ name: runner
 image: {{ include "runner.image" . | quote }}
 command: {{ include "runner.command" . }}
 
-{{ $setNodeExtraCaCerts := false -}}
-{{ $setRunnerUpdateCaCerts := false -}}
-{{ $userEnv := (.Values.runner.env | default list) -}}
-{{ if $tlsMountPath -}}
-  {{- $setNodeExtraCaCerts = true -}}
-  {{- $setRunnerUpdateCaCerts = true -}}
-  {{- if kindIs "slice" $userEnv -}}
-    {{- range $userEnv -}}
-      {{- if and (kindIs "map" .) (eq ((index . "name") | default "") "NODE_EXTRA_CA_CERTS") -}}
-        {{- $setNodeExtraCaCerts = false -}}
-      {{- end -}}
-      {{- if and (kindIs "map" .) (eq ((index . "name") | default "") "RUNNER_UPDATE_CA_CERTS") -}}
-        {{- $setRunnerUpdateCaCerts = false -}}
-      {{- end -}}
-    {{- end -}}
-  {{- end -}}
-{{ end -}}
+{{ $tlsEnvItems := include "githubServerTLS.envItems" (dict "root" $ "existingEnv" (.Values.runner.env | default list)) }}
 env:
   - name: ACTIONS_RUNNER_CONTAINER_HOOKS
     value: {{ $hookPath | quote }}
@@ -91,14 +69,7 @@ env:
   {{- with .Values.runner.env }}
     {{- toYaml . | nindent 2 }}
   {{- end }}
-  {{- if $setNodeExtraCaCerts }}
-  - name: NODE_EXTRA_CA_CERTS
-    value: {{ printf "%s/%s" (trimSuffix "/" $tlsMountPath) $tlsCertKey | quote }}
-  {{- end }}
-  {{- if $setRunnerUpdateCaCerts }}
-  - name: RUNNER_UPDATE_CA_CERTS
-    value: "1"
-  {{- end }}
+  {{ $tlsEnvItems | nindent 2 }}
 volumeMounts:
   - name: work
     mountPath: /home/runner/_work
@@ -108,24 +79,12 @@ volumeMounts:
     subPath: extension
     readOnly: true
   {{- end }}
-  {{- if $tlsMountPath }}
-  - name: github-server-tls-cert
-    mountPath: {{ $tlsMountPath | quote }}
-    readOnly: true
-  {{- end }}
+  {{ include "githubServerTLS.volumeMountItem" (dict "root" $ "existingVolumeMounts" (list)) | nindent 2 }}
 {{- end }}
 
 {{- define "runner-mode-kubernetes.pod-volumes" -}}
 {{- $runner := (.Values.runner | default dict) -}}
 {{- $kubeMode := (index $runner "kubernetesMode" | default dict) -}}
-{{- $tlsConfig := (default (dict) .Values.githubServerTLS) -}}
-{{- $tlsMountPath := (index $tlsConfig "runnerMountPath" | default "") -}}
-{{- $tlsConfigMapName := "" -}}
-{{- $tlsCertKey := "" -}}
-{{- if $tlsMountPath -}}
-  {{- $tlsConfigMapName = required "githubServerTLS.certificateFrom.configMapKeyRef.name is required when githubServerTLS.runnerMountPath is set" (index $tlsConfig "certificateFrom" "configMapKeyRef" "name") -}}
-  {{- $tlsCertKey = required "githubServerTLS.certificateFrom.configMapKeyRef.key is required when githubServerTLS.runnerMountPath is set" (index $tlsConfig "certificateFrom" "configMapKeyRef" "key") -}}
-{{- end -}}
 {{- $extensionRef := (index $kubeMode "extensionRef" | default "") -}}
 {{- $extension := (index $kubeMode "extension" | default dict) -}}
 {{- $extensionYamlRaw := "" -}}
@@ -169,14 +128,7 @@ volumeMounts:
     name: {{ if not (empty $extensionRef) }}{{ $extensionRef | quote }}{{ else }}{{ include "runner-mode-kubernetes.extension-name" . | quote }}{{ end }}
 {{- end }}
 
-{{- if $tlsMountPath }}
-- name: github-server-tls-cert
-  configMap:
-    name: {{ $tlsConfigMapName | quote }}
-    items:
-      - key: {{ $tlsCertKey | quote }}
-        path: {{ $tlsCertKey | quote }}
-{{- end }}
+{{ include "githubServerTLS.podVolumeItem" . }}
 
 {{- end }}