Version 1.0 was made from a cut up old aluminum windsurfer boom. Very hard to sail with. Had no idea how much it affected handing. V2.0 is 25mm carbon tubing. Still a little tricky, but manageable after some brain re-calibration .
azymuth said.. Sweet vid Looks like a good setup. You might like the GoPro Max Lens Mod, it's not expensive and will level the horizon, even in Superview.
Thanks JJ. good to know. I made a sacrificial elbow, but the tube was slipping in the joint tilting the camera.
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Looks like a good setup. 
