if have been having a problem with my guoguan xinghen (no magnets). I can't find a tension we're the cube feels smooth and can corner cut well. If the cube is too loose the screws scratch against the pieces. If I tighten the cube just enough so the screws do not interfere with the pieces, the tensions are way to tight. I haven't put any lube on it yet, do you think that will help? Thanks
