hey- i just bought my first boat last week. an 1989, 19 foot searay, with a 135 hp mercury mariner outboard. its in great condition!! i have been cleaning her up,etc. but i have come across one problem, i can't figure out. the steering wheel was off centered. so, i removed the bolts holding on the steering wheel and re-centered it. but when you turn the wheel to lock in either direction and bring the motor back to center, the steering wheel is off centered again! i see no leaks,etc. is there some linkage i must adjust?? any ideas? thanks