How do I replace the anologue stick mechanism

I recently dropped my hyperkin duke, and now the left anologue stick won't click in, and doesn't return properly.

I have successfully taken the controller apart, and can see that the stick mechanism is broken (it looks like the rod that presses down on the button when the stick is clicked in has snapped, so now it bends up instead of clicking down)

How do I remove this mechanism and what do I replace it with