I did...and thanks to all for the tips and info... The rib roast came out wonderful. On a side note it was colder than a well digger's hind end here in South Dakota (-3 F) on Christmas Day and the MAK ran like a champ.
I am ashamed to admit that I got caught up in the day forgot to get a pic of the roast after it came off the grill but here it is right before it went on
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Belated Merry Christmas to everyone and thanks again for all of the shared wisdom