9mm vs 11mm pumps

[Dave]

Yeh I friggin love talking about pump porn.... favourite part of the car, bar the turbo

I still wouldnt want someone to make a replica of my pump though, purely because i've spent many hours discovering stuff myself. So many things can be learnt about the pump simply by just stripping one?? Many people here have 11mm pumps, so go and strip the old transit pump it came off, they are 99% the same, and alot of things become clear about where advantages and improvements can be made.

And if you dont have the time/facilities/confidence to find out, then your not in any position to do any modifications yourself anyway....