I’ll share this as well. Now I have some machining and tooling which makes this much easier/quicker.. but this guy does it with all hand tools. And he does a pretty fantastic job!
https://www.youtube.com/watch?v=fczCGdZG1iM

Making your own bolt knob is a bit more involved, but doable with your own belt grinder, and you can:


Turn this


Into this


This is Titanium a fun, but can do Delrin polymer, Alumium, steel if you wish.