Amazon.com: EG Starts 4 Player Classic DIY Arcade Joystick Kit Parts USB Encoder To PC Controls Games + 4/8 Way Stick + 5V led Illuminated Push Buttons Compatible Video Game Consoles Mame
Pi Retrobox: A DIY Raspberry Pi All-In-One Arcade Joystick - Howchoo
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DIY Arcade Stick: Easy, High Quality & Affordable - YouTube
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A Great Weekend Project - DIY Arcade Controller - GeekDad