Ok, just for fun......what hand tool that many of us use can be made from just the bits in the pic? Half inch x 150mm stainless rod, 8mm stainless all-thread, and a small spring?
I have several tap wrenches, but my favourite one is just a gnats hair too long for the swing of my lathe. it hits the bed. I've had it since I was an apprentice and don't want to shorten it. So I made a mini one. Probably a bit more style over substance, but it works just fine.
All the edges and the knurling have been sanded down and softened, so it's comfortable to use.