The author remixed this model.
I also don't have long enough M3 screws so I had to remix this one instead of the original.
For mounting generic handbrakes you find on AliExpress like this one
The holes are just tight enough so the screws are held in place while you install the handbrake.
You need to add a pause to fit an M6 Nut inside the print just before the hole starts closing.
Hardware required:
Feels pretty sturdy taking into account it's a handbrake and you will be pulling somewhat hard.