Hi. I am new to servicing diving gear. I came across a few older regulators and want to start servicing my own gear. I have what appears to be a scubapro 109, g250hp, g200 B, D400, Polar, Sherwood 3200, U.S. Divers Micra Adjustable, and Scubamax xr2002 2nd stages and Scubapro Mk2, Mk10, Mk15...