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Hi Bojan. I've used Lazy Susan bearings on some of my dob base projects. Since the largest I could get was a 12" ball bearing type, which has a slight rocking movement, and the only way I could correct the movement was to use 6 tiny 25mm castors, (Bunnings), 60 degrees apart outside the bearing.
With my last dob mount mod, I removed the bearing and just used 6 tiny castors recessed into the dob base. The castors contact a metal ring cut from 0.50mm gal sheeting fitted to the underside of the mount. An adjustable centre axle bolt, (secured to the mount and adjustable at the base). to keep things in place. It moves smoothly enough with one finger.
A tap on the secondary section stops in about 4 seconds.
Hope this helps.
Cheers!
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