You should'nt use WD40, just like door rollers, it will cause premature wearing out. I had a triplex on route for years, carbon dust everyware, caused a lot of vibration and noise in selector. Clean guides and tracks with oil, then only used a drop of 3in1 oil, keep wiped up, this helped best. Too many other minor things to go into here, just do good PM constantly. Somewhere I've got paperwork on these, I'll try to find them.
