I believe he used double sided tape to hold on the speaker. I've done it a few times and I love the exterior strength variety of the stuff.
Something I haven't seen that would be a variation what you've done would be to sand the tube. Then you can get an alternating polished vs. sanded look.
Another idea: Use the foam but cut it in LONG strips. Cut it at a 45 degree angle at one end then spiral it around the area. Repeat and cover the whole bottom. I did this once and it was satisfying, different and I haven't had to replace it. The problem with the foam is the edges getting rubbed against so that spiral all around helps it last.
If I had to vote though on what you've previously done... I'd go for the scoring of lines.
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