Alder Burns wrote:@ Brian White I never measured or anything, just aimed for a good dark brown tea. Put a drop or 2 of dish soap in it to help it stick. The mythology I remember reading is that if you make tea with 2 cigarettes worth in boiling water, and then drink the water, it's a guaranteed fatal dose! So it's pretty strong stuff. There actually used to be a commercial insecticide based on this, called Black Leaf 40. I haven't heard of it in a long time, not sure if it's still around...
Glenn Herbert wrote:You are right that you need more exit airflow, but you could easily get that by making little pillars all around the top instead of a flat top with small grooves in it. I might try six pillars with equal spacing and height as their thickness. Put them toward the outside edge of the top of the chimney so there is just enough inner/upper surface to properly support the smallest pot you want to use.