BB UN-51 won't fit?

[FluffyChicken]

Yes, so the pic wasn't your BB.
It should still fit in if you're fitting it properly and doing drive side first.

 

[Martini-night]

Nope,still doesn't fit. I've done everything by the book drive side first etc etc. Gonna file dow 3mm of bb drive side end threads tomorrow morning

 

[d8mok]

Where are you based? If you local to Chesterfield I’ve drawers full of different BB’s you can try

 

[Martini-night]

Newcastle mate, my pal is coming in the morning with a couple of files to file down the end BB thread. Wish us luck!!!