Anyone Rebuilt an Original Style Vacuum Advance

My 273 started running a little funky, and in testing, the vacuum advance has quit pulling. I think it needs a new diaphram (although, if I could get little darts running around, it wouldnt hurt my feelings). hehe,

Anyways, I dont want to put one of the stamped reproductions on it, as this is the original distributor for the car.

I've heard the original ones can be rebuilt, but would like a little advice on materials I'll need.

In the meantime, how far to advance the timing - sans vacuum advance?

--Chewy.