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Thanks for that, I never would have thought of it not being British threads.
I guess I'll get it down to a bike shop to get the threads cleaned up anyway, and hopefully they have an italian BB I can try out.
I have a Sugino Messenger crankset that I had planned on using, but I might have an issue with finding a JIS bb with Italian threading? I've never ventured into the world of Italian standards, so don't know if they're compatible with Japanese/British standards at all.
Kgrev-
I guess I'll get it down to a bike shop to get the threads cleaned up anyway,
Make sure they have the correct tool. I've seen bike shops use one half of the thread reamer for a bsa threaded shell in both sides of an italian shell and fuck the frame.
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No probs with availability. Shimano UN55 Italian thread bb from CRC is £12.49 - in 107, 110, 113 and 115mm spindle-length.
M_V
c00ps
Pretty sure you have an Italian threaded bottom bracket shell.
It's long been common for Dutch shops to source the bikes they re-brand from Italian builders.
If you had calipers, I think you'd find that your shell measures 70mm x 36mm and the DS has a right-hand (ie "normal") thread, rather than the left-hand thread you find with British/ISO BB.
As the BB you have is British the diameter is less, so the cup falls through the shell.
Why does the NDS engage? Manufacturing tolerances I'd guess: it screws in, but I bet it's pretty loose.
What you need is an Italian threaded BB: instead of "1.37x24T", look for "36x24T". If a BB isn't specifically listed as "Italian", then it's likely "British".
Have a look a Sheldon's cribsheet for more info: the table at the bottom shows you what happens if you mix the wrong shell and BB.