Use a 3/8-16 tap to chase the threads. Also, be sure the jackscrew on the puller is small enough to pass through the hole in the balancer and actually bear against the front of the crankshaft snout. If the end of the jackscrew is bigger than 3/4" in diameter it will probably jam against the balancer hub without pushing on the crank.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!