I not sure why but the arm on my 1999 SL20 lathe has suddenly become loose. that is to say there is a lot of wobble at the pivot where the arm swings down into place. I am hoping to get an idea of what I am getting into before I start tearing it apart. Has anyone had experience with this or know what may need to be done? With it the way it is now my lathe man can be off by over .200" which makes it less than worthless. so he is doing it the old fashioned way with a piece of paper and touching off then taking a light cut to verify. Slow but still efective