Hello Zach,
thank for your help. Unfortunately this did not help. The "activator plate" has full contact to the switch. I even demounted the upper shell of the mouse and clicked on the switcc directly with my fingers. The right mouse click gives a nice snappy accoustical feedback, yes, but there is no response on my computer. In my opinion there must be a hardware malfunction on the motherboard.
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Well I don't know what to now. Seems to be broken, unrepairable.
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