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Im assuming model 12 is longer than the 14 if so it's no good, I have an unbranded bb which is 135mm and it's to long.
Thanks for the offer but I have the cups thanks 2 sets and 2 single speed axles.
I have a Chater lea model 1815/2 bb Im going to give that a try but I'm sure it's still to short, problem is I Am using a Simplex competition (clanger) type front changer which leaves no room for adjustment.
Alas, I do have a model 12 that you'd be welcome to but that's no use I'm sure.
Do have some cups also you can have if any better than what you have.