Merc 140hp I4 just finished installation of lower shift cable and I am trying to determine where brass barrel needs to be. I have the stud on the plastic end guide in the bottom of the slot. I have read six inches from center of nut eye to center of barrel. When would this be achieved if I have the shifter in full forward and lock the prop in the counter direction the barrel is way too far advanced from the nut? I am sure this is an easy fix I just need to know the right adjustment. I read a how do I in mercstuff and it says to go forward then back to reverse till it's right on both ends and so forth, but I am still having issues. Could there be an issue on the upper cable?