Quote: I have a BB small retainer bell that needs to be opened up to accept the med size (4.8 exactly?) OD retainer
Quote: ... retainer that I'm going to turn down to fit.
Confusing but most of us focused on boring the bell.
Myself I would most likely turn down the retainer if it doesnt run into anything.. only because its easier to throw in the lathe than centering the bell on the mill... I do have 2 auto boring heads that would do it but you still need to center the bell
