Flex point

flxible non moving pivot. 
I saw an interesting video about non moving point.

Notice the red point of the small gif does not move. (The black point in the chicken video.)
 

I downloaded the model from the video but I modeled it to better understand the concept I modeled.
The point needs  to be glued in. It is designed for two chunks of filament to use as alignment 

The flex component snaps into the base.

There is a warning that it needs support. This error can be ignored.