My 5x5x5 rubik's cube have a little problem. I mean it's to loose. It's poping for each move I take, and building a 5x5x5 is nothing fun (not if you got to build it more than 2 times at least). And evrybody knows that a cube like that, can't be used. So does somebody know how to fix it? Tigthen it a little? I repeat it's a RUBIK'S not EASTHEEN. That cube wasn't cheap either.