[raymo]

A super cheap D.I.Y. alternative to rotating rings is as seen on my scope.
Steel or aluminium strip 25 or 30mm x 3mm. Attached as shown in pic to
existing threads in top of rings. Bent at 90 degrees at the end. The two
mounting holes are slotted in case of need to move the OTA backwards or forwards for balance purposes. A small piece of Teflon is stuck to the
inside face of the 90 degree bend to make turning the OTA smooth.
I leave the rings slackened off enough for me to be able to turn the tube
easily, and just nip them up when starting an imaging run.
Incidentally, it makes a convenient carrying handle.
raymo