I have an 80 xs650, and I was reading a thread about a guys points that were "rusty" looking. So I decided to check and see if mine were rusty or bad looking, or if they would move like in the video a guy posted. Well I take off the cover and there is nothing there. This is my first bike, and I'm building a bobber with my brother who has good bit of know how, how hard is it to replace/install new points or the "auto advance system" (what I'm guessing I need)?