Delrin replaced with Bronze.
So much wasted effort and cost.
He did not even need to make a new "collar". Take the existing one, cut seal grooves and install scarf cut Teflon seals acquired from a local auto transmission shop (they can help you find a part that is oversize, then trim with an Exacto), and fit two bronze bearings for a suitable sliding fit to pilot the "collar", then bore for a tiny clearance through out except for the bearings. The seals will hold pressure and leak enough oil to keep the bearings alive. Done, and it works on MILLIONS of automatic trannies built every year.
Just watched the video. Being as he made the new "collar" out of bronze, he could have made that the bearing material too. But no, he installed a couple of sealed ball bearings to pilot the collar on the shaft. Hmmm. With nothing holding the inner race to the shaft, the inner race is likely to slide at a speed in between the collar and shaft speeds, and maybe gall and then stick to the shaft. That sealed ball bearing might be OK at these speeds and modest loads, but without the oil in the bearings being turned over, it could overheat. You would need the part number and an estimate of the loads and then go to the maker's catalog to see if the bearing will be OK as a sealed unit.
Now as to the vibration, who knows? Something goes into resonance with some vibe that ramps up and down with engine rpm. Engines make vibration, and we can not know what is vibrating with it, but we do know that whatever it is (wing, wing and tip sail, wing and tip sail and camera on its mount, just the camera on the mount) it gets big at max rpm, and it seems to go through another mode at lower rpm too. Might be the same mode when the engine is at half the speed of the max rpm setting, might be a different forcing function, might even be a different vibe mode.
I would sure want to put a little accelerometer or three on the wing near the camera, on the engine, and on the firewall near one of the mount bolts, just for starters. If the airframe vibe takes off at those power settings, that could be an issue. On the other hand if the wing and tip sail do not go vibe crazy, just the camera and its mount, well, might lose a camera.
Billski