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I had this problem with my ca33e but it was my own tom foolery that caused it. The anti reversal latch was installed incorrectly. It made the gears lock the wrong way. I also had this problem (motor click) with my mp5k but that turned out to be a dead battery. But you seem to be confident that you put it all together correctly. It's got to be a shim problem. Do the gears spin nice and easy without a lot of friction sound?
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