I purchased a Cold Steel Safe Keeper III about a month ago and love the knife. My problem lies with the sheath that came in the package. It is obviously intended to be used with the Safe Keeper but holds the knife so loosely it can just slide out. Does anyone have any advice on how to attach a clasp or snap to the sheath so it can be carried more safely and discreatly? Has anyone else had this problem, or did I just buy a defective product?