String Trimmer brand "Echo" (part of the winding system)

This part cannot be purchased alone and is a part of the complete winding system that starts the engine. (this is part #24 of the set #22)
http://www.jardin-et-motoculture.fr/pieces-detachees/pieces-detachees-par-machine/eclates-de-pieces-tailleuses-sur-perche/echo-1407/hca265es/lanceur-allumage-embrayage-1415/
You can see briefly this part at 2:47 on this video https://www.youtube.com/watch?v=GNvdycbWTM8
All you have to do is to drill a small hole on the top of the 3d printed part so the spr