Thein/Thein Leadpipe for Tenor Trombone (.547") Shires Screw This has been modified with a Shires screw. The mouthpiece shank is compatible with Bach and other shanks, not Thein shanks. The screw pitch is the same, so it can also be installed on Thein Universal II/Belcanto slides. If you need an Edwards screw, it will be an additional 1000 yen. I am selling this because I have switched to a Bach-style leadpipe. I may remove the listing if I find an instrument that it works well with. Thank you.