bushing
qallen
Butch Hongisto installed my tuner on the stock barrel on my 40x and when i had him install a new Broughton barrel he had to "bush" it. He made an alumimum sleeve that was a tight [lightly driven on] fit to my barrel.He made this bushing/sleeve just a bit bigger than my tuner was bored for then re-bored the tuner to fit.He did this so the sleeve would not be too thin.Anyway he put locktite on the inside of the sleeve and tapped it into place.We then installed the tuner in the normal fashion.
It has worked fine for me.
Colt.45