Step 2: Materials and tools
In short, use what you have. You could make a simple undroppable with nothing more than a piece of metal, hacksaw and sandpaper. Here's what I used:
1) Segment of metal with a thread at one end. You could use a lathe, and a die to add this thread, or drill a hole, tap it, and use a bolt.
3) Bench grinder
5) 45 minutes overall.