hmmmm - interesting little challenge - there'd probably be several ways of doing it > >how variable? > Starting at 16 tpi, moving down exponentially to 4 tpi over a 1 inch > length, 3/8 inch diameter > > Peter Chadwick > > 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. > 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.