Studio Spot 575 gobo wheel issue

When I try doing a gobo rotation with a gobo on wheel 2 the entire wheel will eventually start to turn, just a little at first, impeding my beam, but eventually it will go into a full blown gobo scroll. What could be causing this? I've gone in and checked all of my set screws, everything seems tight. Is there an easy fix for this? Thank you for any help you can provide.
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