Join Date: Oct 2004
Location: DC / Maryland suburbs
Bikes: Homebuilt tourer/commuter, modified-beyond-recognition 1990 Trek 1100, reasonably stock 2002-ish Gary Fisher Hoo Koo E Koo
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DO NOT APPLY BRUTE FORCE!!! It should be possible to install a clean, greased BB *by hand*, using the wrench only to tighten it once it's fully in. I've seen too many threads ruined from brute force (most recently a newbie friend of mine destroyed his pedal threads after I encouraged him to install pedals himself and tried to brute-force them in).
I'd be very surprised if that frame wasn't threaded for a standard English BB, definitely. Have you tried cleaning the threads with degreaser and a toothbrush, then inspecting them for any slight damage or cross threading?
Sorry, I can't give any more specific info on the frame, but good luck.