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I also purchased the Walthers 90' turntable and found one problem that was an easy fix. after insalling the plastc bearings and the compleated bridge (minus the bridge deck) I insatalled the gear box with out the moter and then turned the bridge by hand. I found two things that needed attention. The bridge was scrapeing the side of of the pit in some places. I removed the bridge and sanded the contours on each end, were the bogie wheels are located. This helped but did not solve all of the contact with the pit walls. I then realized the pit was slightly out of round. I marked the areas were there was contact and sanded the those areas giving the bridge the clearance that it needed. that was the extent of the physical problem. The next thing I did was to check it out with the motor installed. This is what I found. At 12V the motor and gear whine was not at all acceptable. I lubed the motor and ring gear according to instructions and that did help some. At 12V the thing was going around like an old 45 rpm record. I found 5V dc gave me what I thought was a more realistic speed plus a much reduced motor/gear noise. I don't know if the things that I did will help your situation I hope so. It sure beats paying for a high priced table that might have it's own set of problems.
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