I too have an issue with Fine tuning. I have replaced the Shift cable, remote shift cable & throttle cable. I have ensured that the core wire of the shift cable sticks out 1&3/8 of an inch from the end of the support tube when in forward gear, & that the anchor assembly is 6 inches from center of the brass connector to the center of the anchor point. Forward shifts correctly, the dogs lock when turning the prop counter clockwise, & I hear/feel the dog clutch ratchet when turned clock wise. My issue is trying to get reverse set. The kill switch roller is centered when I shift into reverse, however the prop seems to be in neutral as it spins freely both ways. If I adjust the shift cable to allow reverse to engage, it dosent seem to lock correctly into forward gear. Have gone through both clymers & Mercruiser guides, as well as various Youtube vids. Still cant seem to get it right.