It's actually possible to build a working machine lathe out of the parts of an ordinary car engine. If you really wanted to make society collapse resistant, inc

It's actually possible to build a working machine lathe out of the parts of an ordinary car engine. If you really wanted to make society collapse resistant, including a manual about how to do so, a couple of tungsten carbide bits, and a couple of hacksaw blades with every car would probably do the trick. I think everything else you need (welding equipment, drills, etc) would be fairly straightforward to cobble together.