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I made one out of an old hockey stick I found in my garage. I drilled a hole through the end of it and found a bolt that happened to be the same size as a tripod mount, I put that through the hole and you guys can probably figure out the rest
I made a chest mount from the square thing that it comes on. I used a knife (I don't have a drill) to cut holes in each corner and tied shoelaces around it to hold it on. Actually worked perfectly didn't move at all while mountain biking. Just wanted to see if I liked it before I spent $12 on the knockoff china version lol.