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The barrel describes the complete 2 part assembly including the tumbler and the switch. The tumbler is the mechanical locking mechanism which accepts only your key and the switch fits onto the rear of the tumbler that controls the electrical contacts.
You probably only need the switch (although I bought both to improve the feel too).
Part Number Description Cost
129 545 02 04 Switch 55GBP
140 462 00 79 Tumbler 85 GBP - notice it's shared across the W140 range
I consider it's a DIY job but you need two tools:
A piece of 2mm brazing rod or similar and part number: 210589000700
'Claw-type wrench' for the trim ring removal - or maybe a small pair of pliers will remove yours it all depends on how tight the ring is.
Looks like the job will take 2 hours. I have the full instructions and a video showing he removal process should you wish. I should be undertaking it this weekend but I've been saying that for several weeks now!
Lea
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