It seems to be the season for finding strange threads. I went to use an Italian made variable capacitor this afternoon. No nut for the mounting thread. Investigate, and the damn thing is 11mm diameter, 1mm pitch!!! That's not in any table I've found................. Gave up. Spent 2 hours in turning etc to make a new bush, threaded 3/8-32tpi and suitably bored to make a seating for the ball bearings. A very moot point whether or not making a small enough boring tool to cut an inside thread to fit would have been quicker. With my standard of workmanship - most unlikely! Peter Chadwick Swindon 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.