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Acetone can attack some plastics, probably not chai saw plastics. I've seen oil holes on bars get plugged solid with fines if a lot of hardwood rip cutting is done. It's never happened to me, but it did to one guy I know. Not sure why unless he was flipping the bar without cleaning the hole...

Stupid 355t has the plastic gear in the nonserviceable pump, so it's $40 to fix.