I am having fits trying to get my old mercruiser shift adjustmentight. I have the barrul that fits in slot as high up as I can get it without interfering with the top cable travel. It just seems there is not enough movement in cable to get both forward and reverse. I am getting reverse without throttle opening but forward is not engaged until throttle comes on making for a very uneasy shift. Is swomething worn out down below? I have the mercruiser shop manual and have followed adjustment procedure with no luck. Any help is much appreciated.