- Take one end of the tube which fits onto the (male) outlet feed pipe
- 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 over the other fins on top.
- Add a handle.
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