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Jim, Thanks for your advice. In the meantime I've done some digging of my own. I had already taken the distributor apart, cleaned and rebuild it. My first thought was also that the plate was stuck. Now it moves nicely, so do the weights again. The advance moves if you make a vacuum, but only if it's higher than 400 mm Hg (that's as far as my vacuum gauge goes). I had to use a hose and a large syringe, my lungs didn't like sucking the hose so strongly all the times. I took the advance apart because I thought it could be adjusted (with the screw inside), but that makes little, if any, difference. I think the problem is corrosion of the rod inside the advance or more likely in the advance that makes it move so stiffly. I'm affraid it's just broken, and beyond repair. Now comes the point of replacement. The advance characteristics (and also the attachment to the plate) are different from other vacuum advances. Advance should commence at 50-125 mmHg and reach maximum (5-11 degrees) at 200-300. That's much higher vacuum and less advance than the other types. Yesterday I found I had a book with all this sort of data on my shelve, slightly stupid of my not to think about that before. I probably need that particular advance. I contacted the Dutch importer for Bosch and they are going to try and find one, though he wasn't very optimistic. I'll ring them again on monday and give them the vw partnumber you gave me, lots of thanks for that. If you or anyone else runs into that particular distributor, or advance, please buy it for me (unless it costs hundreds of $$). Meantime I'll use the distributor of my 1600 engine which should work (I think, hope, and pray). Cheers, Theo