Shoulderless fixed cup on 26 TPI Raleigh BB
I have a Canada-built 70s Raleigh Grand Prix frame that I'm trying to build up as a 3-speed all-weather commuter. This frame has the dreaded 26 TPI threading, and a BB width of 71 mm. Unfortunately, I think that the BB cups are too rough. The fixed cup doesn't have a shoulder, it's sort of flush with the end of the BB housing (and was installed before the factory painted the frame, because it's the same blue). So how are these "fixed" in place? with adhesive? And what's a reliable way to remove one without messing something up?
Just in case anyone is tempted to suggest it: I only spent $40 on the frame with brakes and cranks, so I don't really want to spend $120 for a Phil Wood BB.