i have a 1985 110hp evinrude and am using the origianal controls to operate it. the problem im having is with the tilt and trim button. sometimes it works on the first push of the button and most times you have to play with it to get it to work. is that part replacable or must i buy the whole control unit to get rid of this problem? thanks for your help in advance, and thanks for the all the advice you guys have given me in the past. you guys have saved me a ton of money.