Get the broken bolt out and use grade 8 bolts for the puller, or whatever hardened bolts you can find at your local jobber that will fit. If it still doesn't move try heating it with a propane torch, might destroy the balancer but it'll be off anyway. Sometimes ya gotta do what ya gotta do! I have a 54 with just a pressed on HB with no retaining bolt. Mine practically fell off, and that's a whole 'nuther problem!
