I am presently converting a 14" Rockwell wood bandsaw for metal cutting and I need to match the thread of a grubscrew (missing) for a David Brown reduction gearbox, which I assume was made in the UK. The screw diameter measures .216" and the pitch is between a 24 and 28tpi but it is neither a 24 nor 28. The .216" is dead-on for a US #12 machine screw but it isn't that. Anyone have an idea what this thread might be? Regards, Harry 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.