Join Date: Oct 2004
Location: arlington, va
Bikes: surly steamroller fixie, '90 cannondale SR 800
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honestly, i'm a little confused, both as to what you're saying and what your question is, but...
it's recommended that you use a lot of grease or some thread-lock on your BB. and if you want to be perfect, then yes, you should tap your BB shell threads before you install. however, in my experience, installing a BB always gets pretty tight, especially towards the end. also, BB shell taps cost like $1000000.
anyway, just make sure you've got the threading direction right, and make sure you don't crossthread. if it's tight, it's tight.