This time I took the side cover off after draining the tank and filling it with gasoline...all I had at the time. I looked inside and all I saw was a tube with a spring on the end. It all looked fairly clean. I did notice on the side where the rubber grommett was when I took it off, was what looked like a piston, about a half inch diameter with a hole in the side of it. I wonder if that is supposed to go up and down while the engine is running. If it is, that is the problem because it appears to be fairly stuck in position. When the engine is started (with oil in the tank this time) the piston didn't move. I'm going to try to find a drawing of the oiling system on this saw next.