I drilled holes with a step bit. Bunch of them. One grate sits perfectly in the tamale steamer location. I put the top grate five inches down from the lip. Installed a thermometer 6 inches down for ease of grate removal. Make sure to use only three stainless screws for the top grate support about 15" apart. 4 support screws will inevitably be uneven.
Primo XL Oval, Pit Barrel Cooker, Tiernan SOB Custom 24, New Braunfels Black Diamond, Big Green Egg Mini, SJS WSM Mini, Lodge Hibachi, Weber Jumbo Joe
"They'll never forget you 'til somebody new comes along". Eagles-New Kid In Town