- Cut the outside cardboard tube.
- Cover the inside surface in plastic.
- Cut the inside cardboard tube.
- Cover the outside surface in plastic.
- Cut out two rings from cardboard. These will be used as spacers between the inside and the outside tubes.
- Cover them in plastic.
- Put the spacers at the bottom to close up the mould.
- Fill with the insulating mix (fire cement and vermiculite) a bit at a time.
- Spread the mix out and pack down tightly with a small tamper.
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