Articulated Universal Trigger for props and toys

This very well might be my contribution to the 3D modeling world: An articulated, universal, trigger you can add to any model prop or toy. 

In your model, design in a cavity 20mm long x 12mm high x 8mm wide. Print this trigger, add a spring from a pen, cram it in the cavity and you are good to go.

The spring cavity is 5mm in diameter by 14mm deep. 

I designed it specifically to be printed at .2 resolution - I have no idea if it prints well at others. Breaking it in can be difficult, I've found PLA is easier than PETG. 

I encourage anyone and everyone to expand and improve on this design and this concept.