I made this a couple weeks back, but haven't got around to making a video about it yet:
It's based on a design I found here on the forum by low_budget, using a DG413DJZ quad switch IC, readily available at digikey (https://www.digikey....DJZ/DG413DJZ-ND). There's a couple pots for adjusting the centering of the stick. As an alternative to my other projects, on this one I chose to put the buttons on the opposite side of the pcboard from the components, for what I hoped would be a cleaner design, once mounted in some kind of case.
Atari 2600 joystick plugs into the small DB connector, and a 15-pin 5200 extension cable plugs into the larger DB connector.
The black button is the second fire button, in case the 2600 stick is of the single-fire-button variety.