Forgive my naive nature, but where would one find a ball bearing
that one could pressure fit into acrilic??
Look in the Yellow Pages under Bearings.
Most larger cities have at least 1 bearing house. They usually
stock a wide range of bearings. If you describe your application
& the approximate size bearing (outside diameter & shaft
diameter) you're looking for, they'll be able to quote you a part
number & price.
If there is a demand for live centers for wax lathes I could
mfgr a number of small centers (one of hobbies is machining).