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I found a Delrin source in the UK. You can get a sample, which should be enough to make several nut segments, for £5.https://www.theplasticshop.co.uk
You might try Nylon or Delrin "nut segments" on your Xlator Screws. Usually a 12 thread-long nut segment gives our machines a 5um backlash, but we use precision cut 3cm dia lead screws, not threaded rods. For Big Bucks, NSK makes the finest lead screws you can find.