I have 1984 Chaparral 198 with a 228 Mercruiser. Am trying to remove the starter. Have removed two 9/16 bolts and the bracket. The starter will move (swivel a bit) but won't come out. There is one other 9/16 bolt on the bottom of the starter that I cannot remove. Should this third bolt come off, or am I just being a wimp and have not put the muscle to the starter to pull it off. Thanks, JOHN