I’ve run across instructions using PMC silver to make hinged
boxes/lockets. I can’t find the specific online tutorial, but if you
poke around online you should find it. Here is one picture I found
that clearly shows the construction and there are a few more pix
showing it closed, as well as different types of catches.
I hope this is what you’re looking for. I’ve only just signed up to
Ganoskin, and a rank beginner making jewellery. PMC was how I got
into it because I come from a fine art/sculpture/ceramics background.
I always preferred working small, portability being a prime
consideration, but all these years making jewellery never occurred to
me because I don’t wear it. One of these days I’ll learn some
silversmithing. This website is wonderful.