I don’t think you would find a plain brass or copper one, since they would react to the moisture in a shave kit and go green. I do have a chromed brass one around somewhere.That's a fantastic idea! It's be cool to find an old brass or copper one.
No, dont.Another thing that'd work nicely is this stuff:
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Sold in supermarkets or kitchenware shops, in rolls which cost almost nothing, and you just cut to size with scissors. I actually use it for little non-slip pads for stones when sharpening, cos I can't always be bothered to use an adjustable stone holder, but would be great to very easily make little protective storage pockets too.
That stuff is really handy for stopping stones sliding around (and giving grip to open stubborn jars), but it can perish and break down like an old rubber band, espeicially if you live anywhere with heat or humidity. It sticks to whatever it is touching, and the black gunk left behind after you peal it off is really hard to remove. Ask me how I know.