I have a 1995 E300d and the transmission suddenly has developed extremely hard shifts mostly as lower speeds. I wanted to adjust the vacuum modulator but from what I have read it has a small rubber bot that must be popped off to access the pin to turn. This device as a whole can be turned to counter clockwise 190 degrees but that is it.

How does one get this device open? If I wanted to test the cars vacuum would I just pull off that hose and hook it up to a vacuum gauge? Thanks

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