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I have a BB small retainer bell that needs to be opened up to accept the med size (4.8 exactly?) OD retainer




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... 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