|All the files you need|
|Double ended tools ready for final shaping|
The basic process is to cut half circles out of the bristles at the ends and then shape them into hooks as shown side by side in the third image. This should be easy enough to logic out. Use the round files for making round cuts and flat files to shape the hooks
Noteworthy points might be that my best hooks are almost all cut at about forty five degrees if you draw a line from the base of the arch to the end of the hook. You will almost certainly want to cut the inside of the arch before shaping the outside and then remove a lot of material from the shaft leading up to your tool end. The bristles are stiff and you want as little in your way inside the keyway as possible. Polishing is optional but if your raw material is particularly rusted or corroded but it doesn't take much and the tools do clean up a bit with use.
|Different stages of completion of a saw tooth rake|
There are innumerable YouTube videos showing basic attack methods. Fewer deal with tool fabrication. My thought is that tool manufacture is at least as important as the skills one needs for using them. Given the ease of acquisition of bristles and the quality of the metal I focus on making my tools as shown.
Other materials commonly available are windshield wiper blade springs, good but too soft for my liking. That means easy to shape but they wear out much faster and bend easier when you don't wan them to. So, I have and do use these springs but they aren't my preferred stock. A similar common material with potential is bra under wire strips. There are certainly plenty of bras but not so many sitting around waiting to be robbed of the wires. These are also somewhat softer metal and not to my liking.
I'll leave it at that. A couple very basic tools you can get about anywhere and street sweeper bristles you can also get about anywhere and keep a few on hand for later or just find when you need one.
So go out and make a hook and I'll get to work on the next installment, how to make a tension wrench.