Is the "one bolt" the 10mm that I've already removed from the arm that sticks out from the front of the reservoir?

Where is the "clip" that you refer to and how do I remove that?

I really appreciate your help==Jim Herold

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Jim Herold--Current: 1987 190E 16V, 1999 ML 430--Past: 1971 280 SL, 1972 250