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Hello everybody, I've got a problem. No, no, no, not that kind of a problem, there are other places on the net for that. The problem concerns the distributor of my 1500S engine. It's a Bosch, ZV/JCU 4 R 3 which has both a mechanical and vacuum advance, and according to Aaron it's correct for a pre aug '64 wich makes sense. The vacuum advance doesn't work anymore and I've tried to take it apart but couldn't figure out how to fix it. It doesn't look like any vacuum advance I've ever seen, on the body it says: 413 and 81. At the side where the vacuum tube goes in there is a hexagonal bit (17mm) sticking out with a 17 mm bold to close it off. If I unscrew that there's a screw but I can't screw it out only a bit in and out. Questions: how can I fix it, how does it work, and can I use another vacuum advance, if so which one or do they all fit. I'd like to keep the distributor, like not replace it with a 009 or later model. The work on the engine progresses, I found most parts that were broken by the broken valve, including original heads, pistons and barrels. Any advice will be much appreciated. BTW: I spoke to a guy in Germany that specializes in type 34 KG and he told me they are going to reproduce the instruments, including tacho's, for type 34 and also type 3. They will be made at VDO, the original producer in Germany and will be for sale early next year. The type 34 tacho will cost around 500DM ($ 340). Keep you posted when I hear anything more defenite from him Cheers Theo Thepen@pi.net