I made this GoPro speargun mount version 2. When I used to attach GoPro on my Riffe Euro 100X, it has worked great. However, mounting the camera at the very end of the gun was not ideal since the camera was too far from targets. I have had this Mako Predetor 110 speargun, which was not very expensive compared to my other guns like Mori and Riffe. I decided to use this railgun for the test bed. I got all the stainless steel parts from Homedepot for $6. I had to shape the muzzle a bit to fit the screw and the nut. I observed the shot with GoPro Hero2 on my mask at 120FPS to see if the sling will hit the camera. I also wanted to make sure the shooting and reel lines do not interfere with the camera bracket. All seemed to work well. I just have to try with two bands next time.
Parts used:
1 X 3/4 X 1/8 Aluminium Bar (I already had this)
1 X #10-24 3″ Stainless Steel Phillips pan head screw
2 X #10-24 Stainless Steel Hex lock nuts nylon insert
1 X #10-24 Stainless Steel Cap Nut
2 X #10 Stainless Steel Lock washer internal tooth
1 X M5-8 25mm Stainless Steel Phillips pan head cut down to fit
2 X M5 Flat Washer Flat Washer
2 X M5 Flat Washer Lock Washer
1 X Nylon tube for covering screw thread