Hey Tom:
Michael sent to me a Grohe manual. I took mine apart and it looks like there is an O ring that should be the sealer. Mine leaks as well, I just haven't determined what size O ring that I should buy. I looked at the O rings at the hardware store and they have a bunch of different sizes and dimensions. Hopefully, it is as simple as that, as they are about a $1.
Good luck I'll dig that email up from Michael if you need me too. No worries.
DAvid
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