Docedison:
If you can make a "Close" fit you can use glue to hold it in the recess... Or epoxy or shu goo... or?? like I said "Punk it up", I read that thread about your camera and was totally impressed with your skills and imagination... Put 'em to Use...Bob
On the steampunk/renfaire events, I've had bad luck with glues of different sorts holding, so I mostly use screws to hold things together (preferably 1/4" screws).
Note, while I will probably decorate it somewhat, my daughter (whom it is for) is not into steampunk. She is more of a renfaire and WoW type of girl. But the important thing is that it hold the jewelry pieces in place and allow her to do the soldering to attach things. Sometimes punking things up can interfere with the functionality, and since at the moment neither of our work areas is 'on stage', I want to go for core function first.
I do think eventually when she has her tent up and is selling at events, she may want to think about soldering/wiring/etc. during slow periods.