Actually those dimensions came directly from Horizon's website per Pulse XT 60 manual (2 1/4" 57mm). I can not cut enough off the spinner to clear the blades without cutting into the mounting screw holes. The spinner that came with the plane is not even close to clearing the blades even after I cut it a lot. So, what are my options? Should I buy a larger spinner, aluminum spinner nut, try a master air screw prop?