Does any one know if a tool exists for this-- or know a good way to do it?? one of my Lanterns valves will leak a little even when screwed down tight--- I think I need to dress the mating surfaces of the needle valve and seat~~ I might have a couple ideas but this particular valve would probably be impossible to replace if I screw it up---~~ here is a cut away valve from a 220 that I used in one of my classes to illustrate the internal workings of a valve-- The valve I need to dress is not a 220 but the internal workings are the same. Thanks i advance for help or suggestions !!!