After creating a few RetroPie Arcade cabinets, I soon realized how difficult it was to play 4-way arcade games, such as: Pac-Man, Ms. Pac-Man, Frogger, etc. using an 8-way joystick. For a year or so the only solution I found was to buy joysticks that offer 4/8 way restrictors which were quite a bit more expensive than the ones I was using.
I then decided to try to build a solution. You can see my initial video about it here: https://www.youtube.com/watch?v=W97VfAiYEr4&feature=youtu.be
After that worked, decided to build another arcade controller. Worked fine on that too, you can see that video here: https://www.youtube.com/watch?v=7qpNYv4gWv0&feature=youtu.be
Please see the PDF (above/attached) for details on the components and their installation.
After success with the 3D Printed solution, I decided to make this kit available to anyone who wanted to use it. If you would like to see any enhancements or additional inserts for a different controller, please comment here or see the contact details in the included PDF file. If you try it out and it works great on your stick, please post a link to the controller you used it with and I'll update the PDF with confirmed controllers that work with it.
Hope this makes Retro gaming more fun!
Project link on my website: