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Hi Denis,
here is a picture of mine on a 87 420 SEL, so it should be like yours. On the longer sides, there is a small increase in thickness at the base, that kind of makes the withdraw somewhat hard. You move it back and forth and pull upwards.
Before installing, I lubed the contacts with dielectric grease to make it easier in the future. After I greased mine, it also woked again properly.
Good luck
Reinhard Kreutzer
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