Camera Accessory Shoe to Go-Pro Mount Adapter
thingiverse
This adapter will allow you to mount a anything that uses the hot shoe/accessory shoe to a go-pro compatible mount. I used it to create a diy boom mic with an extra shotgun mic and a broom handle go-pro mount adapter I found here... https://www.thingiverse.com/thing:1132874 I used a standard knob/bolt I had with my go-pro and bought an M5 wing nut for the other end.
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