Something I have thought about was heavily nickel plating the worn parts,and then machining them back to size.I downloaded an old book on electroplating written by two university of Sheffield professors ,about electroplating,and it is also possible to plate bronze,actually transfer and deposit bronze by electro-plating.I think this is a possibility worth investigating for carby restoration.Nickel can also be plated without external electric supply,and kits are available to do this.Incidentally,since Cr6 was banned ,hardchrome plating has returned to using simpler safer methods which could be done by an experimenter.A bar to amateur electroplating generally in recent years has been the difficulty of obtaining sodium cyanide. [impossibility actually,]This is a general electrolyte for most plating,if you want the plate to turn out shiny and stuck on.For instance plating copper onto steel,only works with cyanide.This is incredibly useful for old bikes ,as it allows worn crankcase bearing bores to be tight again,without sleeving.Simply plate the steel component oversize as required,and install with a renewed interference fit.Regards John.
