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It is never a good option to use non-standard or modified parts.  If you machine the crown of a piston, every time you fit a replacement you have to replicate the modification.  The Japanese never work on that basis.  All you do is buy their bits and fit them.  I think if I was using a Nourish shaft, I'd buy rods which were in common usage, even if I had to lengthen or shorten the barrel and I would modify the journals to accept commonly available shells. 

Especially if you are racing - if you have to modify every time you fit a replacement part, it becomes a real pain.


There is one bike which is particularly bad with this sort of thing.  With Vincents, everything is a special.  It puts you completely at the mercy of the manufacturers' agents.


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