Step 4: Cut Burn Bowl
This part is the BURN BOWL and serves two purposes. It initially is the internal primer area where alcohol burns to heat the alcohol to vaporization. It also serves as a heat sink, when heated by the jets, to keep the stove at at self-sustaining vaporization temperature.
1. Cut off the neck of one bottle. The cut should be at the tangent where the bottle neck just reaches full diameter.
2. Make a second cut at the top of the bottle opening as shown. This location is approximate. Start out with the cut a little long. it will be adjusted when fitting the burn bowl to the jet deck in step 8.
3. Smooth the edges as before.