I need clarification on instructions provided in Mercruiser Service Manual. I am adjusting shift cables on twin V-6 1998 mercruisers (Alpha One Gen 2). When re-installing the shift assist, the manual says to tighten the rear nut until it bottoms and then back off 1/2 turn. I'm not sure what they mean by "bottom" because the stud is spring loaded. Do the instruction mean to tighten until the spring is fully compressed and then back off; or bottom until the nut makes 1st contact with the shift assist unit? Thanks for your help.