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Tardy said.. 
here ya go ..i used a quicksilver hat because it had a stiff peak ..then I got the chick to sew the straps on which i got off a older surf hat ,then used two bolts to go through ,then ground them off flush ,then cut and glued a piece of fin cover to the bottom of the brim which made it even stiffer and now it floats ,if it gets ripped off ya nog ,I made it so you feed the go pro from the top ,so if the go pro rubber comes loose ,your head will stop it from coming out of the bracket ..
Hummmm.... where have I seen THAT before?

Hint.... I just bolt it to the brim using a very short Tripod mount with a 1/4" threaded camera hole.
Dakine Trucker hat has the chinstrap built in and the brim is thick and stiff.
I usually get more than a year out of every hat before the brim gets smashed so many times that camera starts to wiggle a bit when surfing.
They didn't seem to make it anymore, but it is finally back online!!! Yea!
Maybe it was my bitching that got it reinstated
www.dakine.com/collections/caps-trucker-hats/products/surf-trucker-s20