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I do not know for sure, but my take on this issue is the bronze, teflon bushings are bearing and the parts slide on one another. Rubber bushings or not soppose to be bearings and relie on the give of the rubber for movement. Holding these rubber bushings so they will not rubb (they would destroy themself if they did) might be the issue. Weltmeister does not make a bushing for the early flanbloc cars becouse it clamps and would lock those front arms with polyurethane bushing. Interasting question that I have wondered about also. Fritz
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