This is pretty niche but in a home workshop it's much easier to make something with a slotted head than posidrive, torx or hex. You can do it with no special t

This is pretty niche but in a home workshop it's much easier to make something with a slotted head than posidrive, torx or hex. You can do it with no special tooling. Heck, you can even do it with a Swiss army knife. The best solution for more complex shapes I've seen for that is a rotary broach, a device clearly powered by witchcraft[1]. The problem is that rotary broaches are not cheap tools for an amateur so if I have to make any kind internal fastener socket myself, for now, it has to be a slotted head still despite being clearly inferior. I had a new found respect for simple stuff like screws, bolts and fasteners, that cost pence or less, once I started making things in a workshop. 1. Actually rotary broaches are really simple but weirdly fascinating devices once you know how they work.