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@Sanddancer
I'm trying to build up an old Dave Lloyd TT frame and have run into bother with the BB install. When I got the frame it came with an old style spindle & cups BB, but it was no good for my chainline. So I got a 103mm Token sealed jobbie that should be just the ticket, but I've hit a snag.
The non-drive side is perfect, but when putting in the drive side (with the actual BB attached, I can screw it in until there is maybe 3mm of threads left to go and then it just stops. At first it screwed in with a light amount of resistance, getting a bit heavier toward the end and then wham, it's like hitting a wall.
I've taken it out and had a look in the shell and all I can think is that maybe the tubes of the chainstays come through the BB shell/lugs and sit a little proud of the inside of the shell and the new BB goes a little deeper than the old cups.
Does this sound right and reasonable? It would be nice to hear that it's a common occurrence before I take a Dremel and Grinder to the frame to try and get it to fit...