Almost every part you will need including instructions is available from the two suppliers that Capatain mentioned. The best thing to do would be to send the regulator to either of those guys and let them rebuild it for you. They have lot's of knowledge, allthe parts and equipment to make it a fully diveable regulator. I have met both and done buisness with both. They are the best! You can do the work yourself, easy enough, I mostly do but then I have been fooling with the things off and on for years. Your best bet is to send it to one of them.
We just returned from a vintage diver gathering in Wisconsin. Great diving, great people, crazy cool equipment, one group took their double hoses to right at 200 feet--Vintage Tech diving!!
Please visit both of those web sites and join in the forums both offer and let us know how your regulator does for you. Welcome to vintage--the wave of the future, simple, no rules, no snorkels, no BCs (unless you want), no ocatapuses, just great diving.
N