Hydroforming a handpan, a percussion musical instrument.
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More:
https://en.wikipedia.org/wiki/Handpan
Previously:
https://www.homemadetools.net/forum/...852#post167656
https://www.homemadetools.net/forum/...223#post180707
https://www.homemadetools.net/forum/...2575#post96634
https://www.homemadetools.net/forum/...911#post167827
https://www.homemadetools.net/forum/...338#post169462
https://www.homemadetools.net/forum/...077#post168561