Newbie here so i don't have all the terms down pat but will try.I have a mercruiser 140 with Alpha 1 gen 1 drive.Shifts into forward and neutral is good but won't shift into reverse..Engine cuts out before even trying to go into reverse from the switch as roller is way up top instead of in the middle where it is suppose to be.Tried to adjust shift cable as manual says.Forward no problem.I unhooked cable and pulled cable while turning prop but prob will only click and will not lock.Only way i can get it to lock is tap arm mechanism under bell housing.