In a message dated 16/06/2007 10:59:41 P.M. Pacific Daylight Time, wbeech at flash.net writes: I have found some chrome knockoffs that are supposed to be for a TR3/A/4, they are described as 'fine thread'. How do I know if my TR3 is fine or coarse? I thought they were all the same.... ____________________________________ It is coarse. Bill S.