I’ve been using a leash on my GoPros since I first started to use the cameras for boating. I have been well aware that if knocked off my boat or helmet that the backdoor of the GoPro will be put under a great deal of stress.
This week I made another leash and add a half-hitch around the thumbscrew. All things being well this should help take the impact load if the leash is ever need.
More GoPro stuff can be found here.