I have the same problem. I need the part that goes on the metal piece that allows the blades to turn. I have all of the other pieces. It must be round on the inside and square on the outside to fit the various parts.The part that turns is about the width of a large screwdriver. I can find nothing except an identical one on E-bay. By the time I pay shipping, I could buy a new one. Mine is the same number as yours. You could check e-bay also.
ppesterfield@charter.net, January 2008