Melissa,
 
    Curtis (currently in France) found that the rosin powder falls off the wheel during rosining and collects between the two pieces you are describing. The plastic and the metal disk start screeching and they tend to bind up. The best bet is to remove the wheel and clean the two pieces and maybe increase the gap by a hair or add a piece that will protect the gap from getting dust in it. Without seeing it that would be my best guess and how you would accomplish it I am unsure.
 
     Hope this helps,
 
   Scott

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