Should there be any up and down play on a motor shaft or should the bell be snug to the borrom? Mine at about a 1/64+ play. I got my CF props yesterday and was going to try then out and found out that they are not marked right or left hand rotation. So I took a guess and put the props with the outward leading edge on the left side of the prop to be a right hand turn. And the leading edge of the prop on the right side to be the left hand turn props.