Add a detent to you CH Products Pro Throttle to turn it into a forward backward throttle.
There are 2 versions with different stiffness, pick one depending on the filament used and resistance you want. I printed mine in PETG, TPU 95A was too soft.
No supports needed.
Installation
To install turn the throttle upside down and remove the 4 rubber feet with a flat head screw driver or similar (they are glued on with sticky tape).
Unscrew the 4 screws under the feet with a phillips screw driver.
Unscrew the middle screw that holds the throttle plat in place with a phillips screw driver.
Place the new printed part as per the image and screw back in using the same screw that was removed in step 3.