I built a baffle for my offset smoker using the top from my old grill. Pictures and commentary below. This is the hole in my smoker that I'm going to baffle. Here's the old grill about to meet its maker. This is the poor top that is about to get cut up and beat up. Here's the baffle (left) after plenty of math, cutting, snipping, beating, and drilling. Here's the baffle sitting in its place in the smoker.