Push-Slide-Lock Blade Adjustment

No opening or unscrewing

Hold the knife in the operating hand.  Make sure the knife is closed
With the thumb of the oppisite hand, press and hold the safety release button on the bottom of the knife.
Press the operating button with the other hand and slide the button all the way forward.
Release button and simply lift out the blade.

Simply put thumbnail in opening at top of knife and pull open compartment.  Insert extra blades and close.