My 1971 9.8 shifter was stuck when I bought it. After removing the LU, the shift cam acts reversed since rotating the shift shaft all the way clockwise puts it in reverse. Did Mercury make an opposite hand housing? When I looked at the internal casting pics online of other housings, I see a stop cast in the cavity on the motor's left side that wouldn't allow the cam to be flipped I think. Is mine on the right side? I'm trying not to get into the LU for this impeller job.