A couple of years ago, I bought an old refrigerator (so old the users manual was on clay tablets) that had been drilled for a faucet and had a set of Sankey connections, a old regulator and a CO2 tank. One of the things that I did was to buy a rebuild kit for the regulator that replaced all of the seals, rings and diaphragm. It was easy job and the regulator has been operating perfectly since. It seems to me that the kit only cost $10 or $15 or so.