Actually it is possible to replace that tumbler with just an allen key. As it turns out, or as it did for me, the tumbler has only one sprign on it, at the top, the bottom does not have a spring, so there is no need to put anything in the slot. This was the story for me, I was quite dissapointed, but it sure made the job easier. I also used an allen key on my w201. The new tumbler also did not have the bottom spring.

xp

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1985 190E 2.3L - a constant project.