Things You'll Need
Instructions
Lay the watch face-down on a cloth to avoid damage to the crystal and bezel. Working on a sturdy, flat surface ensures that the tools don't slip and mar the watch.
Place the fork of a spring bar tool where the spring bar connects to the lug to retract it and release the band. Both sides of the watch band should be removed so that it can be placed easily in the vise or watch case holder.
Attach the watch to the vise or watchcase holder with the caseback facing up. Most vises or watch case holders have four pins to secure the case. Turn the wheel to tighten the pins to the case, making sure it won't budge.
Adjust the spanner wrench to the appropriate width for your watch case.
Fit the opposite sides of the wrench into two notches that appear around the perimeter of the caseback.
Turn the spanner wrench counter-clockwise until the case comes off. This should only take four to five turns.