- Feed the 100/130/150 tube through the hole you made earlier on the drum, male side on the outside with the ridge against the outer wall of the barrel.
- Mark, on the tube from the inside, the point where it meets the wall of the barrel.
- Take off the tube and cut 15 mm beyond the line.
- Then cut out fins in this 15mm band stopping at the marked line using metal shears, a jigsaw or a grinder. These should be 1cm wide so that the they are easy to fold back.
- When all these have been cut out, re-position the pipe and fold the fins back.
- If necessary, put a few rivets or self-tapping screws to fix it securely.
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