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Thank you, massplumber2008, that worked.

The advice given by another to use the plumber's wrench under the sink does not work too well. The Grohe unique mounting/fastening system doesn't work well...

Do you mean a standard US pipe wrench or one of these Plumber wrench - Wikipedia, the free encyclopedia

I assume that's the generic name for Channel Lock pliers. Tried it. Might be losing my grip, or that's one stubborn nut. (My wife calls me that all the time, maybe it's just payback.)

I was trying to tighten mine form the top, but the nut is so tight that the wrench just slips. (Using an adjustable wrench, but fully tightened). The flat sides "indentation") of the nut are slight,...