The strap of my Casio GW 700 broke at the point of attachment. I thought about just buying a new watch but decided to try a new strap first. The strap didn't come with instructions, but you really don't need them. Using a jeweler's screwdriver, I removed the 4 screws holding the broken band, pulled out the old band, and replaced the new band with the old screws. I did not replace the unbroken part of the belt. This took about 10 minutes. The new group corresponded exactly to the old group.