Hi Ash,
I had sticky bearings once on a home made dob. The simplest fix is to try virgin teflon instead of the plastic that it sounds like is supplied on your scope.
I did what you are proposing with the bearings on both the altitude and azimuth bearings, except that I kept one teflon bearing on each surface. This added back a little friction and gave a very nice motion in both axes. The bearing solution works best against a metal surface although I have found it works OK on smooth laminate too.
Good Luck!
Rod.
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