Interesting, I have to buy a can and try it out. You probably have to keep on applying more of the stuff, but sometimes there can be threads, the tip of a broken needle, a pin or something stuck some where. Inspecting, wiggeling, shaking, having the machine on the side, up side down, and yet more wiggeling of the hand wheel can sometimes give results. I know it's not easy with heavy lumps of metal like the 319, but within doable.