Ok iam lucky I live only 20 mins from his shop.so when I got my new harmonic tuner the threads are 1/2 unf. I have mkll that has shroud with 20 m x 1 . emailed those guy s. Pj Clarke got back with me told me I could stop y around 10 .they hooked me up with latest greatest .great company and the atmosphere in shop well hell I would love to work in a place like that but when you get a group of pros together .say no more.