i just tried to get the clutch dog on my old 6hp johnson out, i got the lower cover (skeg?) of but couldnt remove the shaft that carries the gears out because of the shift rod. the manual says the power head has to come of to remove this rod, is this right? sounds a bit extreme. sorry i dont know the year because the plate has been removed and i havnt been able to find the number on the core plug listed (a0603527)