We ordered yesterday from
www.Roton.com We used them because I wanted to make sure all parts "mated" the first time rather than having to modify/send it back/wait for right part. We prototype d with smaller lead screws from Igus that we had hoarded from past years. We used Igus' sleeve nut and flange to test. It worked great! We're having a build off between a cable/Modulox modified transmission/CIM lift system and the screw next week. I'll post a video of the build off unless it really sucks badly for both.
Here's what we ordered:
59284 Acme Lead Screw, 1/2 - 10, RH, Steel
89403 Acme Sleeve Nut, 1/2 - 10, RH, Bronze
89838 Flange, Steel
19660 Acme Anti-Backlash Flange Nut, 1/2 - 10, RH, Plastic