A) Scrape and clean shaft thoroughly (use emery tape). (Photo #1).
B) Use a dial caliper to determine where taper (if any) ends from propeller hub. (Cutter cannot be mounted over taper.)
MUST BE CLAMPED ON STRAIGHT SHAFT. (Photo #2) For acceptable installation refer to Diagrams A, B & C here. C) Also check shaft size. Shaft should measure .002 over nominal; metric or oriental should be ordered to exact .001 (Photo #2). D) In preparation for installation - disassemble cutter: (1) Loosen stationary blade screws only 1/2 way out (screws #4 on Line and Net Cutter Assembly). (2) Remove screws on rotating cutters.