I posted a link to the southern style collars in the video section on here. There is small cable that should have came with ur go pro that u can run thru the lead loop on the collar for a backup incase the mount breaks or a screw comes out or anything.
Here's the link
http://www.southernstylecutgear.com/#!cutgear/c235j it is the last one on the page at bottom.
Shotgun
Arkansas