Okay. I know that it is almost impossible to overtighten a prop. That being said, I am trying to tighten the prop nut on a APC prop with a cheap plastic spinner backplate. I know you have all seen this happen before, right before I get the nut tight enough, the plastic backplate starts to slip. The backplate has to align just right with the prop for an added degree of difficulty. What do you guys do? Maybe a thin rubber washer?