- Take one end of the tube which slots onto the (male) ash tray outlet .
- Cut, adding 15 mm onto the length needed.
- In this 15mm strip, cut out fins a centimetre apart trying to have an even number as this will look better.
- Fold every second fin towards the inside.
- Reuse the cut out circle from the drum to close down the lid.
- Place the circle on the folded back fins
- Fold the other fins over.
- Add a handle and a small door to control air intake.
The system of controlling primary air (in the ash tray) should be rigorous and efficient.This allows you to control the power from combustion.
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