Mechanical GoPro SteadiCam Gimbal

To recreate this device, print this piece with the rest of the original pieces in fouceau's model (see link) and assemble according to their instructions.

I used a 5/16 inch (Freedom Units) tap to create threads in the bottom hole in the center part of the gimbal. A comparable metric tap should work. I put a bit of plumber's thread tape on a foot-long 5/16" threaded rod and screwed that into the tapped hole. I then used two nuts and two lock washers to secure an entire package of large washers onto the rod for a counterweight.

Combine the gimbal pieces with VikingScientist's helm-cam selfie arm (https://www.thingiverse.com/thing:233185) or a comparable GoPro arm and create a waterproof SteadiCam that doesn't need its own set of batteries.

As for mounting it on my boat, I use two different solutions. On my rotomolded sit-on-top, I use a Scotty #135 Portable Camera/Compass Mount attached to a Scotty #429 Extended Gear Head Adapter seated in a Scotty #344-BK Round Flush Deck Mounting Bracket. For my thermoformed sit-inside boat, I use a Delkin Fat Gecko mount with an extender rod.

I filled in the center hole using TinkerCAD, slapped a GoPro mount on top of it, and put a new hole in the bottom for a 5/16th-inch threaded rod.