I found the trick was to practice on the new one as you hold it in your hand. I used a heavy duty paper clip as a probe, with a straight cut to the end. There was a certain amount of trial and error involved, but all in all it was not that bad of a job.

It is worth noting that the tumbler changed design somewhere along the line, within the 126 series of cars. I think it was around '87 or so, and from that point you need a U shaped wire tool to extract the tumbler.

Kevin

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'85 300SD