20mm RAM mount arm with rotating sockets
thingiverse
RAM mount with rotating socket designed for 20mm balls. Sockets are designed for M6 HEX bolts and washers. I used an M6-1.0 x 35mm HEX bolt with an M6-1.0 wing nut. I included a 130mm arm, with the sockets, center to center is 190mm. If you want to make your own length, connect the joint to a 20mm diameter cylinder or anything you want in between. The sample is everything put together minus the hardware and with the 20mm RAM ball mount: https://www.thingiverse.com/thing:5573674
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