Half circle GoPro arm

I purchased some ABS GoPro arms from Amazon but they're way too flimsy. I designed this for a specific purpose, but it works well for embedding the camera within the confines of the arm itself and that's precisely what I needed.

I mount my camera on this arm using my Offset Camera to GoPro mount adapter and my 1/4" Camera Thumbscrew with embedded M3 bolt for strength.