20mm water pipe GoPro Collar
thingiverse
This collar for 20mm water pipe features the standard GoPro mount. There are 2 different lengths included. The longer one is suitable for the corelines A2 lightbox. (http://www.instructables.com/id/A2-overhead-corner-LEDs-lightbox/) Instructions Print 1 off part. File to fit if needed. Use standard GoPro hardware or M4 machine screw 20mm long with 2 washers and 1 nut.
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