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What sort of speed are you hoping for, I got the impression you were after a bit of a goer with flash steam?EN3B will be fine for the webs. Reason for asking about assembly method is that you can't really have a hardened pin and silver soldered joints as you want the assembled crankshaft to cool slowly which will not harden the pin. For slower speeds you don't really need to think about hardening.
Graham -As you don't mention pins, I presume you don't use any.That Robinson is a beauty!Cheers,Gary