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@noggin
I'm in the process of rebuilding my 30yr old Viscount Aerospace as a SS. I decided to upgrade the knackered stock cup & cone bearing bottom bracket to a modern sealed cartridge unit, BUT when I came to install the new unit I discovered the down tube, seat tube and chainstay ends protrude into the inside of the BB shell at the joints. Although there was plenty of clearance for the old BB axle, a cartridge won't fit.
I'm thinking that it's Dremel time - considering grinding off about 3mm of the protruding tube ends to clear the way.
Any thoughts? Anyone hit a similar snag? Am I about to terminally wound a piece of nice old British steel?