In 2007 I made this 'Franken'Throttle" for a friendly using the guts of a Microsoft Sidewinder gamepad - USB controller, and two potentiometer.
The base box was from a deceased Suncom F-15 joystick
Grip from PCB pipe and leftover plywood from a RC model aircraft kit, plastic sheets.
Push-buttons from electronic store.
2 axis and 12 buttons.
After all painted black, the grip was covered with synthetic leather.
"Secret components": the knob for the pot in the lower grip under thumb, a plastic gear, and the HAT cover... a toothpaste lid.
With today 3D printer facilities don't need this... exotic materials.
The more trickly part is the connection of the throttle lever with the potentiometer, the lever can't placed direct in the pot, the lateral forces will destroy the pot fast, but need a flexible coupling in between.
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