Over at Aircraft Resource Center is a collection of articles on working with photo-etch parts and tools:

[URL unfurl="true"]http://www.arcair.com/TnT-archives/Photo-Etch/01.shtm[/URL]

You might enjoy browsing those.  The authors mention an outfit called The Small Shop, who make the Hold and Fold tool, among others.  Small Shop's website is https://thesmallshop.com/  You might enjoy having a look at their site, too.

Best regards,

Brad