Hello all,
I'd just like to add my $0.02 on this method - just recently had cause to use it as the Z axis on my Maximat V10P milling head stripped out the unusual thread on the nut - just over 0.55" X 16 TPI (evidently a unique acme used by Emco Maier). With replacements non-existent, it was either come up with a way to replace it entirely, and in all probability with a 5/8"X8 Acme, or make a new nut.
In desperation I tried the acetal method and so far it is working perfectly, in many ways, better than the original, but worn, nut. I highly recommend this method if one cannot get or make a replacement nut.
Best,
Mike