REMOVING JAWS: Pinch the current installed jaws together with thumb and forefinger lightly and using a single prong on your depth key, push the pins holding the jaws out the front of the sharpener. Pull these pins out one by one to release the jaws and remove them from this vise.
INSTALLING JAWS: To install the quarter inch jaws, simply slide them into the vacated slot in the vise and ensure this lever is in its upright, unlocked position and then return the pins to their original slots. It may take a little bit of fiddling to reinsert the pins but once they find the correct position they will slide in easily.