CDJ 900 Jogwheel

I recently bought me a pair of CDJ 900's and I really like them. There is however one minor issue that I would like to address. There is a difference in how the jogwheels "feel" while spinning them.  If you compare the jogwheels of the 2 players, it seems if one jogwheel rotates slightly rougher than the other. (like there is somekind of brake keeping it). I think the problem is not serious enough to return the player to the dealer, but is it possible to adjust this?