I can almost garuntee it's not on all the way.

My 1/2" impact is rated at 600ft/lbs in reverse and can break off 5/8" (16mm) dually wheel studs but will not seat one of these because of the nature of the design (hammering action instead of steady push).

"Hitting it with a breaker bar" is using force on the bolt and bolt head against the crank to try to pull it on. That is much different than having a stud threaded all the way into the crankshaft and a nut (applying force to the stud threads) forcing only the pulley on.

Then again, whatever works.

No disrespect Greg, you have some sweet-ass homemade tools that are proven to work better than the over-priced and delicate K-M tools issued to GM dealers! Many of you have good cheater methods too....