Just an ancient bicycle bell lever. Replaces broken one.
Print with small support under spring hook.
Original lever had this hook at the bottom of model, but then the spring is scratching metal base which was not professional in my opinion.
The author remixed this model.
Remixed from similar model. Changed shape. Added conical shape at the axis (my bell has 1mm round base at the bottom of axis). Moved spring hook up to leave some space for spring.