I have an '90 200hp Johnson. I need to replace the waterpump impeller. Clymer's manual does not well describe how to release the upper end of the shift rod so I can drop the gearcase down. I see a small bracket with a grease fitting on one end and a slotted screw on the other and a hex bolt in the middle. Is this the part to disassemble--if so the hex or slotted bolt? The appears to be no easy way to reach the hex bolt without removing the carbs. I have to believe there is an easier way. Is there a special tool?<br />Regards