Double nut the prop shaft, turn the bottom nut to remove the shaft but, don't remove the shaft the entire way. Remove the double nuts, wind one nut down the shaft, now place the two blue prop washers on top of the nut. Use three of the prop bolts at 120 degrees and slowly tighten each bolt. As you reach the bottom of the prop shaft you will have to losen the shaft then apply more pressure on the bolts. You'll reach a point when the hub will just pull off!