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You can send your Norton crank off for professional dynamic balancing.  Or you can do it yourself by removing the flywheel, installing a temporary bolt in place of the center pin and reversing one cheek exactly 180  degrees.  Then dynamic balance it by lightening the heavy cheek.    It won't be perfect but it will be much better than stock.  Then bolt it up as normal and static balance by drilling along the middle of the flywheel - for do it yourselfers and if done right you probably couldn't tell it from a professionally dynamically balanced crank by the seat of your pants.