I can't quite get rid of the last half inch on the CB5. The hero blobs are grinding, and I don't yet have the balls to go any further down. Should I accept that I've done the necessary? Or is there some lateral thinking available to the FOAK that will nail this one? (Suggestions of sandpaper or hacksaws would miss the point of the exercise.) No doubt if I go around a roundabout continuously, the blobs will begin to grind down. But at what rate?