Quick demo video, cheesey, I know!!!
https://youtu.be/pFlvhZdzYMg
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Mount a spinning pole with a GoPro, on your helmet and get some interesting camera angles! I designed this one specifically for my helmet (Bern Macon). Safer than comparable models out there as you don't screw anything into the helmet. In the event of a crash, the 3D printed parts will break instead of your head!
Materials needed:
(x1)1/2" PVC pipe
(x1)GoPro of your choice
(x1)Handlebar mount
Counterweight (In this case I used a small can of food but typically a bolt and nut with washers does the trick)
(x3) Ball Bearing 625 2RS 5x16x5 (I used leftovers from an Openbuilds project)
(x1) Nylon Insert Hex Locknut M5
[http://openbuildspartstore.com/nylon-insert-hex-locknut/]
(x1) Low Profile Screws M5 25mm
[http://openbuildspartstore.com/low-profile-screws-m5/]
(x1) Precision Shim (Washer) - 10x5x1mm
[http://openbuildspartstore.com/precision-shim-10x5x1mm/]
(x2) M3-0.5 22mm Steel Socket Cap Screw
I recommend sourcing these parts from somewhere like your local Fastenal or other similar nuts & bolts store.