You are all mostly missing the point. Why design something that needs a special tool if you’re not going to include it? Even IKEA includes them. Why even design it so it needs a tool at all? You could make it so you can turn it with your fingers, just knurl the edge and have it protrude. The one in the pic looks about right, except leave off the hex slot if you don’t want it torqued.
And before you make assumptions about someone’s misunderstanding of written instructions, how about you try to read what was written in the first place.
I did find something that fits it that won’t be able to torque it. Just hand tight.
This is a truly dumb design of what should be a simple piece of plastic.