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Old 06-13-2019, 08:28 PM
JonWint JonWint is offline
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Join Date: Mar 2016
Location: 1 hr from Nazareth
Posts: 671

Metal donut looks like toilet water supply wall cover:

StewMac's TrueChannel uses a nylon donut:

You would have to buy the entire carriage for $116.

You could lathe-turn one out of nylon or Delrin.
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