Whilst investigating the likely ‘method of manufacture‘ of a small component; my google search led me to this fascinating 40 page chapter
Die-Making for Hydraulic Forming in the Small Studio Environment
**LINK**
https://static1.squarespace.com/static/5127a143e4b0c404ec2f29e9/t/5cdc7234b11c5700015c55fd/1557951196486/Poirier-Phil-2017.pdf
The source document is not clearly referenced, but I will post a link if I can find it
MichaelG.
.
Edit: __ That didn’t take very long :
https://www.riogrande.com/product/2017-Santa-Fe-Symposium-Proceedings-Book/550491
https://www.riogrande.com/product/2018SantaFeSymposiumProceedingsBook/550501
Edited By Michael Gilligan on 23/08/2020 08:18:56