Piere, Look on Page 69-77 in Ian Bradley's booklet "Metalwork and Machining Hints and Tips. It is "Workshop Practice Series, Booklet No. 20, and gives complete dimensioned drawings. He calls it a "wobbler". Al Messer __________________________________ Yahoo! Music Unlimited Access over 1 million songs. Try it free. http://music.yahoo.com/unlimited/ 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.