Gentlemen let me tap your knowledge. I have a new Persistence that I noticed the liner lock is engaging at about 40%. The lock-up is solid with absolutely no blade play. I have experience with several different companies blades that use a liner lock. It has been my experience, or maybe good fortune, that other lock-ups have started at approximately 10-20% when the knife was new. Of course with age and wear this changes and that is my main concern. What is your experience with the Walker liner lock used in this knife. Thanks in advance for your wisdom.