I ran into the same thing last week with an X lead screw off one of those. No longer available from Gravotech. I've been wanting to contact these guys about a replacement for the M40. Don't know if they'd do a one off, but may be worth a try. Sales@helixlinear.com. They're in Beachwood, OH. The Quality One tip may be the best. Good Luck, Let us know.


Nick Michalares