Physical interaction design DH2400

This is how we made a button with adjustable depth needed for pushing it.
A & B: screws
C: metallic plate mounted under the button surface
D: cables mounted in the screw and metallic plate (if they connect the button is pressed)
E: Foam pushing the surface up towards screw A.
F: The button surface with a hole for screw A

note: This assembly is to be built in all 4 corners of the button.