In this photo you can see a couple of either high or low spots about half way down the inside of the prop & the concentric "rings" I was talking about.


This prop was worse before I started but the shots down through the bore never came out good enough to publish (note to self remember to bring flash!) This photo was only after about five rotations. I spun it a total of 22 rotations and these high/low spots were no longer visible making for a much better fit interface.