Wayne, I am trying to install a new prop on 250hpdi, i removed prop and adding a flo torq 2 kit. It appears i have a built in washer against the lower unit, i install the black insert into the prop, slid the prop over shaft and then installed the end unit (locking unit to splines) into the prop and locked unto the shaft splines and then put my washer back and locking nut to 55lbs of torque and finished with cotter pin...I havent swapped a prop in 15 years do you think i did this correctly or did i miss a step or install wrong..thanks don