Rubik's Cube Modification.

Change the center shaft, screw and spring of Rubik's Cube.

This cube is target.("This" 3x3x3)

Disassemble edge and corner pieces.

  

Loosen the screw.

I will put this new center shaft, screw and spring.("Maru" center package)

 Original is white color.

  

Lock new screw to spring with center shaft.

Adjust the degree of tightness.

Assemble back.