What do you camera restorers use to lubricate the rails of a metal field camera, like the Technika III. I just bought one very cheap and it is obvious that it had not been used for quite some time, so all the movements are "sticky". I cleaned the camera, replaced the leather and the bellows - all I need now is the movements to work smoother. There was a lot of gum on and in the rails from the old lubricant. Any help would be greatly appreciated.