diff --git a/CHANGELOG.md b/CHANGELOG.md
index b6b63ad..832648a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,18 @@ Per-release NetBox / Python compatibility lives in
 
 ## [Unreleased]
 
+## [0.3.8] — 2026-05-19
+
+### Fixed
+
+- **"Trace this core" button no longer appears twice on the Strand
+  detail page.** v0.3.7 wired the `plugin_right_page` slot into
+  `strand.html`, which made the `StrandTraceButton`
+  `PluginTemplateExtension` fire — but the template also kept the
+  pre-v0.3.1 inline `{% include 'netbox_osp/inc/trace_button.html' %}`
+  workaround, so the button rendered twice. Removed the inline
+  include; the extension is now the single source of truth.
+
 ## [0.3.7] — 2026-05-19
 
 Three audit fixes bundled together.
@@ -426,7 +438,8 @@ GPS markers.
 
 - PyPI name-reservation placeholder. Not functional.
 
-[Unreleased]: https://github.com/iamjohnnymac/netbox-osp/compare/v0.3.7...HEAD
+[Unreleased]: https://github.com/iamjohnnymac/netbox-osp/compare/v0.3.8...HEAD
+[0.3.8]: https://github.com/iamjohnnymac/netbox-osp/releases/tag/v0.3.8
 [0.3.7]: https://github.com/iamjohnnymac/netbox-osp/releases/tag/v0.3.7
 [0.3.5]: https://github.com/iamjohnnymac/netbox-osp/releases/tag/v0.3.5
 [0.3.4]: https://github.com/iamjohnnymac/netbox-osp/releases/tag/v0.3.4
diff --git a/netbox_osp/__init__.py b/netbox_osp/__init__.py
index c31a1c1..fce330f 100644
--- a/netbox_osp/__init__.py
+++ b/netbox_osp/__init__.py
@@ -5,7 +5,7 @@ class NetBoxOspConfig(PluginConfig):
     name = "netbox_osp"
     verbose_name = "NetBox OSP"
     description = "Outside-plant fibre management — cables, splice closures, fibre links with loss budgets, and an offline-capable Leaflet plant map."
-    version = "0.3.7"
+    version = "0.3.8"
     author = "John McKean"
     author_email = "33052970+iamjohnnymac@users.noreply.github.com"
     base_url = "osp"
diff --git a/netbox_osp/template_content.py b/netbox_osp/template_content.py
index ddbdf0a..8509fe2 100644
--- a/netbox_osp/template_content.py
+++ b/netbox_osp/template_content.py
@@ -110,9 +110,9 @@ def right_page(self):
 class StrandTraceButton(_TraceButtonMixin, PluginTemplateExtension):
     """Inject the trace button onto netbox-osp Strand detail pages.
 
-    Some installs disable template extensions on plugin pages — for
-    those, the strand.html template embeds the button directly via
-    {% include %}. This extension covers the standard case.
+    Since v0.3.1 wired plugin_right_page into strand.html this extension
+    is the only path; the pre-v0.3.1 inline {% include %} workaround was
+    removed in v0.3.8 to avoid drawing the button twice.
     """
     models = ["netbox_osp.strand"]
     _trace_url_view_name = "plugins:netbox_osp:strand_trace"
diff --git a/netbox_osp/templates/netbox_osp/strand.html b/netbox_osp/templates/netbox_osp/strand.html
index 660e155..16cb059 100644
--- a/netbox_osp/templates/netbox_osp/strand.html
+++ b/netbox_osp/templates/netbox_osp/strand.html
@@ -22,8 +22,13 @@ <h5 class="card-header">Strand</h5>
                 <tr><th>Loss (dB)</th><td>{{ object.loss_db|floatformat:3 }}</td></tr>
             </table>
         </div>
-        {# PR E — visual core tracer entry point #}
-        {% include 'netbox_osp/inc/trace_button.html' %}
+        {% comment %}
+            The "Trace this core" button is rendered via the
+            StrandTraceButton PluginTemplateExtension into the
+            plugin_right_page slot below. The pre-v0.3.1 inline
+            include was removed in v0.3.8 to avoid drawing the button
+            twice once the plugin slots were wired.
+        {% endcomment %}
         {% plugin_left_page object %}
     </div>
     <div class="col col-md-6">
diff --git a/pyproject.toml b/pyproject.toml
index c774ca5..0b1a491 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "netbox-osp"
-version = "0.3.7"
+version = "0.3.8"
 description = "Outside-plant fibre management for NetBox — cables, splice closures, fibre links with loss budgets, and an offline-capable Leaflet plant map."
 authors = [{ name = "John McKean", email = "33052970+iamjohnnymac@users.noreply.github.com" }]
 maintainers = [{ name = "John McKean", email = "33052970+iamjohnnymac@users.noreply.github.com" }]