05/200 Optimax Merc flush mount control. Having trouble going from forward or reverse back into neutral. There is no grinding of gears at any time, just a lot of resistance. Cable is ok, idle is ok at neutral and when in gear. I don't think it is the hand control because when I go to put it in neutral (from forward or reverse position with the engine at idle) and it hangs up, I can shut off the engine and try it - and it goes smoothly right into neutral. Is there an adjustment on the engine I can do?