invention

If you added a little backstop (just a small lump of metal) to each of the six arms that form the core of a cube, so there's a backstop just below each centerpiece, the backstops would prevent the springs inside the centerpieces from pushing the centerpieces inwards any further than the position...

I just wrote a post about the making of the Rubik's Cube (for a maker stories series). What do you all think? Any suggestions of things to include is much appreciated! http://stories.maker.me/rubiks-cube-making-the-worlds-most-popular-puzzle/