Hi !
For Christmas I got a GTS M and a stickerless Valk M. The GTS M is fast and turns perfectly, but I feel like my Valk M has been drowned in lube. It turns very slowly (I guess that is why the magnets look a little bit weaker), the "The Valk" logo printed on the white center has progressively been totally erased, and when I first touched it my fingers got sticky and viscous. I also think the centers are screwed tighter than on my regular Valk puzzle. I think it's part of the "premium" treatment, but that might be a part of the problem.
What can I do to fix this cube ? I have already turned it for hours but it has changed nothing.
Thanks by advance.