Morris Dovey wrote:

| A friend who saw my machine gifted me with a threadless lead screw
| that uses Thomson's precision-ground shaft material as the
| "leadscrew". It seems backlash-free and it's as frictionless as I've
| seen. It's made by an outfit in Minnesota. I'll try to remember to
| take a photo to post here.

Photo attached.

--
Morris Dovey
DeSoto Solar
DeSoto, Iowa USA
http://www.iedu.com/DeSoto/