That was, surely, the basis of a design that appeared in ME some years ago. Might have been by Martin Cleeve. To me, it seemed a complicated way to do a simple job. http://www.alanstepney.info Alan Stepney's Model Engineering, steam, and workshop pages. ----- Original Message ----- From: "Shep" <shep.28@xxxxxxxxxxxx> devices. An even more basis device, which I have not made, but which should work,certainly on the finer threads, is to hinge the cradle of the cutting tool, and swing this upwards to clear the thread on reversing. Cheers! Hubert MODEL ENGINEERING DISCUSSION LIST. To UNSUBSCRIBE from this list, send a blank email to, modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject line.