I have a endura 4 lone wolf tool model that Ive had for many years. It has lost that "snap" when locking and there some side to side movement when lightly pushed developing when blade is out. I can see a gap develop when I lightly push on the back of the blade when locked out. I called Spyderco and the rep said they dont do any work unless its a manufacturer defect other than sending it in to sharpen. Ive retired this endura for now but would like to tighten this one up. What should I do?