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@xroads
Im pretty sure my Pug had a Swiss threaded BB, as the UK threaded replacement (BB-UN26 68x113) would only go in freely about half way (even after wire brushing threads). However, I applied a bit of force and it fitted nice and snug. Its never worked loose and I've swapped the BB with a replacement since, with no issues.
Heres sheldons crib sheet
http://www.sheldonbrown.com/cribsheet-bottombrackets.html