I believe if you put a small magnet just inside the chamber, you could feel if it is attracted by the tube, or not. I doubt anything is left of Purbaugh's place. Claude is dead and I think Bill and Jerry are out of the business, probably retired, like many of us. Like the others, I doubt Purbaugh made tubes of steel. He originated the use of aircraft aluminum for tubes, chamber and tube made from one piece. A total weight of 8 lbs. also suggests aluminum, to me.

> Jim Legg <