This may not be anything to new but I just wanted to give a heads up to anyone who is experiencing vertical play in their endura. When I just bought mine it was solid as rock, no play in any direction. Well naturally I carried my endura everywhere and it started to develop the dreaded vertical play after hardly any real use. I HATE blade play, so much so that I stopped carrying my beloved orange endura for a while. Saw a thread on cleaning it out as a possible cure and gave it a shot. Took the whole knife apart and saw that I had some serious lent jammed in there, cleaned it up and put it back together and was pleasantly surprised. The play was almost completely eliminated besides a faint little click of the lock bar if I really wrench on it. Now its back in the rotation baby! So if you are experiencing the same issue (which seems to be pretty common with these among other lockbacks) give it a try.