I thought I'd start another thread for the X Axis conversion part of this project.

Last night I removed the chip collection trays and cleaned all the loose chips lodged underneath. Next up I removed the sliding curtains that shield the X Axis ways and lead screw from debris. This enabled me to access the adjustment nut that compresses the bronze split nut that runs on the lead screw. I'd noticed quite a bit of backlash in the X axis so tightened this up to see how much backlash could be removed and whether I could use the existing 3mm pitch Acme leadscrew, or if a new screw and nut was required.

The best adjustment I could get still had about 0.06mm of backlash - if I tightened the nut any more the friction was excessive, and most likely would lead to excessive wear on the screw and nut.
So further disassembly is required to see how a replacement screw and nut can be fitted.