Surface area of the sector and spur gear, how much space do you have between them? Chances are they are being pressed together, in which case you'd take offf one shim from the to pof the sector gear and put it on the bottom, then try the closed mechbox again til you get it unjammed. most likely, but could be something else. And avoid following a shim guide as to where to put what thickness of shim, it rarely works, and there are different tolerances between parts, especially mixed and matched brand parts.
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