Just got a Police 4 LW in K390 (and immediately blued the blade). Other than the "letting the choil hit the closing hand" technique described above, the Police has a long enough handle that you can try a different one-handed closing, where you brace the bottom of the handle at the base of your hand, plant your thumb near the pivot, then use your index finger to depress the lock. Takes a Kevlar index finger (and maybe loosening the pivot a touch), but I have found with the Police and the Endura that you can swing the blade all the way shut. Mandatory Safety Announcement: Make sure you are clear of the blade path and start slow. A stainless Endura makes a fine pinky guillotine.