Thanks Jeff,
I have been there years ago; I'll have to see if I can get there next week to price things out (list is growing). Mark Hellrung also let me know he has them at a much better price than I saw on McMaster if anyone else needs them.
I'd be worried an aluminum washer would gall up the sprocket or bracket when they came in contact at speed. Plus the chain has worn into both sides so I would need 2 to center it. I could be off, but my thinking was the delrin would be slippery on spinning parts yet keep it centered.
Bill
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