Is the grate a 7440? Because I belive the 7440 is smaller than the original 7431 that they come with.
I don't have a 7440 to measure, but I think it slips thru the steamer ring to actually rest the heat deffuser on the bottom of the pot by just cutting part of the grate like brian did.
http://tvwbb.com/showthread.php?40019-Ribinator-2000!&p=408608&viewfull=1#post408608
I tried doing it to my 7431 but it would not fit. I even cut the opposing side with no luck.
I am an idiot! Your response encouraged me to take another look. Well, what do you know, the STOCK grate was placed at the very bottom of the tamale pot. And you are right, the two additional ones purchased at home depot were meant to be used as the charcoal grate. All is okay now! The cooking grate has more bars than the charcoal grate.
I feel like an idiot creating this commotion. Sorry all!