Help with noisy Arkanoid spinner

RetroInjection

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My Arkanoid spinner makes a very harsh grating sound when it is turned, and the vibration is annoying. I have another one laying around that doesn't make noise, but it doesn't seem as though the white "teeth" are moving with the spinner. Is there any way to get this thing to shut up? Thanks.
 
First make sure the toothed wheel isn't contacting the opto or anything like that.
Then look for any gunk in/on the gear teeth and clean if needed.
If it's not one of those... it's a bit of a PITA, but I managed to get mine quiet. I had to disassemble it and reassemble it several times, slightly shifting the alignment of the top plate as I re-assembled. Eventually I got all the gears aligned well, and it spins easily and quietly.
 
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