OK i have a 63' johnson 28 hp outboard. it's old but after a thorough flush of the old feul, carb cleaning and change of the impeller it runs like a champ...however when we took it out we were unable to go forward but reverse worked fine upon futher inspection we disconnected the cable and pulled this "keeper" rod looking thing out and pushed the shifter down futher by hand and it worked so my question is how do you adjust the shifter????