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Make sure the spacer tube is inside and down in the hole in the circuit board. The way to do this is make sure it's fully seated before tightening the two screws that hold the board on. If you tighten the screws then put the spacer on, it will likely only go on as far as the surface of the board, which then means when you crank down the nut, you're just sandwiching the wheel down tight against the tube.
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Chicago, IL