I made an extractor for a 617.912 (diesel) engine out of a 8mm bolt and nut from Lowe's. I threaded the nut all the way up to the head, slipped on a couple of washers and a short socket about 3/4 inch diameter with open side away from the washers. Screwed the bolt into the pin then used an wrench to tighted the nut down against the washers and socket. THe end of the pin is about 5/8 inch in diameter so make sure you have the socket centered. Once I pulled it out about 3/4 of an inch it came free. Good luck.
1984 300D Euro