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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