I bought some bar stock at home depot and filed a knife out of it a while ago - started with a rotary tool, but the cheap make broke down quickly, and I was thinking it was the end of that idea, but filing turned out far easier than the alternative, and than I expected - I turned a blade out in fifteen or twenty minutes, but have not hardened it (no need for a second and bayonet-like knife!
) It's aluminum, so I doubt it would be extremely resilient...
Plastic dropcloths are to tarps as plastic is to metal
Duct tape held a belt that split in half so well that I forgot there was tape there for a month...
Not urban or explorational at all, but I once modified a cap gun to use antimony trisulfide/potassium perchlorate matchhead material as propellants for airsoft bbs as a sort of cap and ball gun, cap ring became primers, got it to use an airsoft barrel, and it didn't really impress (100 fps at best, usually bbs sort of roll out.)
There's so much that I've wanted to talk about at some point and can't remember
right at this one moment!