This is a recreation of a picture I saw on Bluesky of a similar joystick.

I made this as a single button controller.  It uses a 24mm Sanwa button and a Sanwa / copy JLF joystick.

I also made a 2 button variant.  You will need a relevant joystick cable, a PG7 cable gland and some M3 hot-nuts to make the joystick and interface it to a computer or console of your choice.  A standard megadrive extension cable can be used for a lot of up,down,left,right,fire,GROUND machines.  You could also wire it up for use in a 2 button setup (such as Atari 7800) if you wanted.  You can also add in a ‘zero delay’ USB interface and use it on a PC/MAC?Linux computer.