Put all the shims on and slide the pulley on it will go on and off easy . , I set mine between 10 to 15 thousands , being the springs in the pulley move. just eye ball it--- it ---it--- that it is how far it can be and work well. if you do not have a way to measure it,, use two credit cards together. The magnetization comes in at around 1500 rpm also make sure that none of the rivets go below the sc plate,, you can test by put the pulley on a peace of paper hold the paper , with a little pressure push down and turn the pulley if it spins without ripping the paper it must be good. mine was sitting on a black Formica table , and i was playing with it ,,when i picked it up i had scratches on my table, Shi* screwed up my table. good luck. jim