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A comment on Straightening out brass instruments (2013).

Re:Straightening out brass instruments (2013) by kazinator on Friday March 15, 2019 @06:46PM (#19405028)
Speaking of hammering from the inside: that's how you make "jumping beans" using a steel ball wrapped in foil:

https://www.youtube.com/watch?v=Y9sl1jLlekk

Made lots of these as a kid.

https://www.youtube.com/watch?v=3BwIOSpD6ro

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