I bought a Sears 3/4 drive 1&13/16 & that's when the fun began. Get the 3/4 to 1/2 adapter if you don't have it. (By the way, the socket also fits old VW bus rear axle nuts. Another useless fact.) That freaking nut is on there! I had to fabricate a holder to immobilize the pulley & used a cheater on the end of the breaker bar before I could budge that mofo. Some people use a chain wrench to hold the pulley but that scores it. You'll need a welder, a yoke of some sort, a couple pieces of short pipe, & a handle to fit to it to rig a holder. Run 2 bolts through the short pipes into the holes on the pulley, grab aholt to the handle to steady it, & wrench that nut off!