could anyone tell me how to get the main rotor gear off the main shaft. I,m down to the sawish plate and have taken the nut and bolt off also lossened the set screw on the collor and the shaft moves up and down but short of driving it out with a screwdriver and hammer I'm at a loss . I don't want to brake something while trying to get it out. I'm new at this, its trial and error. THANK YOU Jim