Try this guy on Ebay under number 290448499618. I bought one of these for my Southbend 13" and have to be honest been bloody pleased with it. You have to machine the plate to match your saddle slide. Check the details so that you get the right size on his pages.

Thanks that looks good, dose the dovetail holder tail pull in really tight? £100 seems to be about the price for them as well

When I built my machine a couple of years ago I had to have the ballscrews machined.
The guy who did it is an experienced tool maker who is used to working with hard materials etc
But he had a right job machining the ballscrews because they were so hard :sad:
Yeah I'm not expecting it to be easy, just want to have a fighting chance by using the most suitable tools.

In general a lot of these are only case hardened, use a grinder to take off the bulk and the the lathe to square everything up
That sounds perfectly feasable but isnt there a danger that the heat generated will futher harden the shaft?