So I thought I wanted a stainless steel 4 blade impeller to improve performance on my 50/35 Honda outboard jet. I bought one at an impeller shop in Anchorage for nearly $400 and tried to install it. I was having problems getting the thing to clearance out at .030 all the way around the impeller. (by the way I had read somewhere that you could set clearance at .015 with a stainless impeller, it that wrong?) It seemed out of round? I bought a new liner thinking that it was the problem. Still wouldn't clearance out properly even with no shims behind it! A close look showed that it did not have the same taper as the liner. Lots of clearance at the leading edge, and tight at the back. I took the impeller back and traded for another one. Same problem. Got my money back and went to a different shop and ordered a new one. I think I was getting used impellers that had been trimmed up on a lathe and done so at the wrong angle then sold for new? Anybody have two cents to throw in on this one?