I ended up ordering some 1/2-8 2 start Keystone Acme screw class 2C and nuts from Dumpster. I will let you all know how these work out. For me retrofit mill I used Thompson ball screws .004 lead accuacy, with a single ball nut. I reloaded them with new balls and they ended up with .0005 to .0025 depending where you checked them. It works pretty well, but I would like to find some bigger balls for it. Any have a sorce for these. The ones I used were .125 +/- .0001.
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