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Someone else here had this issue the other day.
The BSA bottom bracket is 70mm.
It should be 68 or 73.
3 options:
>face it to remove material (don't have the tool to do that)
>use a 73mm bottom bracket with 1.5 mm spacers on each side
>use a 68mm bottom bracket with no flange on the NDS and have asymetrical crank arms