While reading older threads, I found Building a KISS Gasifier and am still going through that one but I found a comment from @SteveUnruh
For the longest time I was insisting from experiences that woven fiberglass stove rope would seal airtight. It just took using the larger diameter rope; with a made rope holding channel; and opposing raised compressing bead. Ha! Ha! Most ignore the opposing squeezing bead. Versus a flat surface squeeze. These will unevenly squeeze. And with use, wear, leak.
I don’t understand the “opposing raised compressing bead”
I have a feeling this could fix my leaking lid problem if Steve or someone could help me understand how this is made.