Weber vents Oven gasket on lid Raised the grill up an inch, I ditched the charcoal pans, I'm running the snake method with lump coal now Supco Type K therm... Still waiting on the meat probe, but it works well for the smoker temp. Holds temps well. Didn't take long to keep it steady, still fluctuates from 220-235 pretty heavily. top vent nearly wide open most of the time, bottom two about 1/8 open. I think it's partially due to me going with the flat oven gasket and riveting it on, it doesn't fit to well and needs to be forced on so there's some leakage going on. Another reason may be, the tower isn't actually round, the lid didn't even fit with out a gasket when I opened it up. I had to do a little flexing on it to get it somewhat round. I got it 3 weeks ago, cooked a spatch cocked brined bird on it un modded, doh. It wasn't bad though. Finally finished my mods and am running my first real smoke now. Cooking for one tonight, woman is helping her mom through surgery. Friends all seem to be busy.