would not spin of agitate

I first had to take off the back and the top to get to the pulley and the belt. The pulley had woobled so much that it had worn out the center nad it would no longer hold to the post in the tub. It also had cut into the back of the tub about a 1/4 to 1/2 inch. I unscrewed the nut holding the pulley and removed it. I then took a knife and trimmed the rough edges off the back of the tub to make it smooth. I then smoothed out the end of the post that the pulley fits on so the new pulley would fit. I tightned the nut and put the belt on the motor drive shaft and Used a robo grip to hold the belt as I turned it onto the pulley. I but the back and top back on and that was it.