i just bought a 25 mariner 1998 great runner but it pulls to the right on my 14 ft. mirrorcraft boat. i think the little fin thingy above the prop was messed with from the previous ownwer. would this sound about right? is this where i would adjust for this pull? it just has one bolt up top of the lower unit that holds it in place and looks to be able to rotate, so am i right in this being adjustable to correct for this?<br />please help as it is a great little motor or do i have a problem somewhere else? 