Windsurfing Mast Mount for GoPro Hero.

More info here.

You will need a screw and a wingnut, stainless steel, size 2-inch 10-32, sold in hardware stores. 10-24 is OK too, 10-32 is just a finer thread, a bit easier to tighten. Metric size is 5-cm long M5.

Make sure to sand the bottom with 200 grit (until it is smooth) then 600 grit (until it is shiny) sandpaper, then use 3M VHB tape to mount it.

To ensure the camera does not ever rotate in the attachment, use 600 grit sandpaper on the mount in places it contacts with your camera's attachment rings. After couple of minutes of sanding (at 600 grit this is really polishing) you will notice the mount starting to look shiny. Attach the camera and notice the improved holding power.

If you have different handlebar diameter, let me know, I will upload adjusted model.

To ensure the camera does not ever rotate in the attachment, use 600 grit sandpaper on the mount in places it contacts with your camera's attachment rings. After couple of minutes of sanding (at 600 grit this is really polishing) you will notice the mount starting to look shiny. Attach the camera and notice the improved holding power.