Recently, the rubber part of my 300sd key broke. I fixed it with some Rhino glue and it held up for a while but after a few months, was starting tto break again.

Thought I would have to throw away the key but my mechanic had a repair kit for it.

Small plastic envelope from MB with a clever repair kit inside. Works well.

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DCM

1977 240d
1980 300sd
1987 Chevrolet Suburban