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Great thank you, this all sounds very positive and seems the Shimano BB route is the cheaper and easier way to go rather than trying to source the Mavic one and then trying to figure out its weird facing.
Its obviously going to be cheaper too so I can get a few different inner ring sizes to try and may get away with the 39 after all, cheers.
user75204
Sounds like someone has been overzealous with the facer.
As @LWaB suggests, full size Italian bb with a spacer. Shimano unXX should be available in Italian threading.
As for the chainrings, I can't see why there would be a limit on the tooth count of the smaller ring. It looks like they use a threaded insert and a spacer between the inner and outer rings, but you should have all that present on your current set up.