This is a travel limiting stop for the Saitek flight simulator quadrant. Prevent accidental thrust reversing at bottom throttle! With a light pull of the tab you can bump the lever down to hit the switch.

I used this spring kit: https://www.amazon.com/gp/product/B08RXV6WH2

print in orientation shown with support.

Also included is flap and landing gear button extenders. attach with 3M VHB foam tape.