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Just thought of something else
I also made up a couple of plywood disks the same diameter as the inside diameter of the tube. These has a couple of bolts drilled through the exact centre. Removed the mirror as the weight is pretty equal. Suspended the tube on these bolts in a couple of simple bearings (V shaped timber screwed together).
i was the able to rotate the tube around and add weight so that there was no imbalance. A bit fiddly, but I can move the 10 around the sky and there is no need for brakes on RA or Dec.
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