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Hello Richard:

On Sun, Jan 8, 2023 at 03:17 PM, Richard wrote:

... available from Arc Euro in the UK as a spare ...

Indeed ...
Thanks for the heads up, I had seen it last week while looking for a solution for the backlash in my U3, thinking that maybe a part from some other lathe could be modified/adapted.

Good to know this one fits.? 8^)

... make my own from 1/2" bronze bar ...

Last year I made a nut (sans the spigot) to use along with the original nut and a coiled spring to separate them, making a device such as those used in hobby CNC machines to reduce backlash:



But it was a failure as there is very little space between the top of the feed screw and the bottom of the slide:



It is ~ 0.90mm without counting the crest of the feed screw thread, so it is probably down to ~ 0.70mm.
A coiled spring expands under tension and altough I managed to file/sand one and make it work to reduce the backlash, at some point the slide would jam.

The nut is a ~10mm cube and the way it moves in is 10.5mm high by 12.5mm at the bottom and 13.5mm at the top.
Not much room below the nut and not much to either side.

Thank you very much for your input.

Best,

JHM