This is from KAI,
The majority of our knives require a Torx bit #6 and Torx bit #8 to fit into the head of the screws. The Torx #6 fits the pocket clip screws, handle screws, and safety lock screws on all of our current model Kershaw knives. The Torx #8 fits into the pivot screw. Some of our larger Zero Tolerance models require Torx #6, Torx #8 and Torx #10 to dismantle the knife.
Please be sure to use a Torx bit and not an Allen bit, this is a common error we see. The slight difference in shape will strip the heads out of your screws. I believe torx tools are available for purchase at Radio Shack, Sears, Harbor Freight, Lowe’s and various other hardware stores at relatively inexpensive prices. It may be a good idea to have your knife with you when you are shopping to be sure you purchase the correct size bit(s). We offer bit sizes #6 and #8 in a Keychain for $9.95. If you would prefer to purchase a set from us please call our #800 line below or provide us with your mailing address and a credit card number including authorization code and expiration date.
You have the option of adding blue Loctite to the threads of the handle, pocket clip and pivot screws to ensure a tight fit. Loctite can also be purchased at any hardware store. Allow the knife to dry for 24 hours before using again.
This is from an e-mail I got from KAI when they took care of one of my knives.
Most of our pocket knives are designed to have a pocket clip and be attached to your pants pocket while carrying on your persons. When attaching and carrying a Kershaw knife on your pants pocket, make sure to have the knife inside your pocket with the spine of the Knife blade up against a sewing seam to ensure the knife cannot open while you are carrying it.
Thank you for carrying a Kershaw / Zero Tolerance!