> On this 'sleeve' here are two depressions. One is deep > and the other is shallow. Hi Luke, I think what you're looking at on the stationary shaft is erosion. If the point of contact wears excessively, you can rotate the shaft to a clean spot. Rob =-=-=-=-=-= Rob Skinner La Habra, California mailto:rskinner at rustyiron.com http://www.rustyiron.com