24" LCD cinema display panel weight

does the spec weight of 21 lbs. ( http://support.apple.com/kb/SP502 ) for the 24" apple cinema display include the stand? If so, what is the weight of the panel without the stand?  I'm looking at monitor arms and most say that the max weight is 20 lbs..
Also, does anyone know the weight of the VESA mount plate for the cinema display?
http://store.apple.com/us/product/MD179ZM/A/vesa-mount-adapter-kit-for-imac-andl ed-cinemaor-applethunderbolt-display?fnode=53#overview
Thanks!

Perhaps all it needed was a restart. I first tried clamshell mode and there was no flicker. Then I tried with the lower graphics and no flicker. Now I've restarted with higher graphics turned back on and it hasn't flickered yet. I've re-opened all the programs I had open at the time as well.
I've marked this issue as resolved but if it recurs I'll be sure to post here.

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