diff --git a/topics/04_mechanical/index.md b/topics/04_mechanical/index.md
index 827d5b63bbb1f367cc4aa535622156baeb98be29..ff9808946baf511192a575717fc52ff0e7b112ba 100644
--- a/topics/04_mechanical/index.md
+++ b/topics/04_mechanical/index.md
@@ -51,6 +51,20 @@ https://youtube.com/embed/vJdcbhGa7Jk
 <ul> <li>CNC Machine -&gt; Workspace alignment/present setting / workpiece measurement, digitizing or inspection</li> </ul>
 <iframe src="https://youtube.com/embed/IcVv1So1n_8" frameborder="0" allowfullscreen=""></iframe>
 
+
+Optical Optically tracked touch probes
+<a href="https://www.gom.com/nl/metrology-systems/gom-taster.html">GOM</a>
+
+<img src="images/gom_touch_probe.jpg" alt="GOM touch probe">
+
+<div class="youtube-embed-wrapper"> <iframe src="https://youtube.com/embed/wt4PLgbwxQI?t=92" frameborder="0" allowfullscreen=""></iframe> </div>
+
+
+### Digitizer Arms
+
+Passive Robot Arm
+
+
 ### DIY
 
 DIY Projects
@@ -59,17 +73,9 @@ DIY Projects
 <p><a href="https://www.instructables.com/CNC-Manual-Touch-Probe/">Touch Probe</a></p>
 <p><a href="http://www.homemetalshopclub.org/news/12/presentation_1202.pdf">Building a Digitizing Probe</a></p>
 
-### Digitizer Arms
 
-Passive Robot Arm
+# Large Scale
 
 ### Digital Templating
 
-# Survey Prisms
-
-Optical Optically tracked touch probes
-<a href="https://www.gom.com/nl/metrology-systems/gom-taster.html">GOM</a>
-
-<img src="images/gom_touch_probe.jpg" alt="GOM touch probe">
-
-<div class="youtube-embed-wrapper"> <iframe src="https://youtube.com/embed/wt4PLgbwxQI?t=92" frameborder="0" allowfullscreen=""></iframe> </div>
+### Survey Prisms