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I worked on one of the 3171s and got improved but noisy operation. One change is a temporary fix and that was to remove one motor screw, loosen the other motor screw, jam a piece of .060 styrene between the motor and the housing and then tighten up the remaining motor screw. This allowed the motor gear to mesh better with the large ring gear. I will return to relocate the other motor screw after I have used the table in the layout for a period of time. The other fix is permanent. I made small curved pieces of .010 and .040 styrene laminated together. Then I located the small pieces between the large gear and the pit bottom at 4 places. If you trace the outline of the motor/gear casing with a pencil onto the pit bottom, you can locate these pieces so they don't obstruct the housing and are equidistant around the gear ring. These pieces stopped the wobbly movement of the gear ring and the turntable bridge and tightened up the movement of the bridge so that it remains fixed in position when stopped. The next step is to try to work out some way that the wipers will remain in contact at all times with the brass sleeves on the shaft. Any ideas. I don't want to remove them if I can avoid doing so since the lead wires will twist and affect the movement of the bridge.
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