[alistairsam]

A few pics of the OTA cradle. Niko, this was driven by your comment in snake valley last year. All good, will explain when we meet.!
I needed a quick release mechanism to adjust the ota or balance it, so I ended up using suitcase latches on the two halves of the cradle.
Just Cut off the sides so it stays slim, centering of the two pieces is taken care of by the ota circle as the tolerance is very small.

I drilled a 25mm hole 3/4th the way on either side for the delrin shaft and a screw locks the shaft to the cradle. that way, the motor will drive the delrin shaft and ota.
the delrin shaft rotates on a 25mm teflon coated bushing thats inserted into the fork arms. that way I save weight on traditional bearings and housings and kept friction low even with load.

to keep the cradle centred, I made two shaft collars and used a hard disk platter as a bearing surface. so the cradle stays centred at all positions. as long as the fork arm flex is low, the ota axis should be aligned to the RA axis.