Tracked one down...a few things. Closed, mine also has that little amount of up-down play. Also, when opening manually, with no flipping, the blade has some sort of stop or bump in the pivot, causing the blade to stay open. It will stop the blade almost exactly half way (similar time how some slip joints have a stop in the blade when they are opened)... **Edit** Upon disassembly, found that one of the bearing races wasnt seated all the way in the frame. All fixed now...Smoooth action.