my casio gshock has been through a lot, and as robust as these watches are, the rubberised strap tends to crack ( in places where they are subjected to stress on a regular basis) after a few years. I didn't have the cash to go out and have it replaced, coz, it involves changing the entire casing moulded water resistant casing.
Step 1: Materials Required
don't bother with quick setting glues , for some reason they don't work on the rubberised surface of the watch strap
2) Bit of Velcro, cut it to roughly the width of your watch strap
3) A pair of Scissors
4) A small vice in which you can leave the strap (held firmly)for 24hrs (for the epoxy to dry)
Step 2: Glue Velcro to Watch
glue the velcro to the watch like so
NOTE: use the rough hook part of the Velcro on the watch, so that when you wear it, its facing away from your skin
Step 3: Glue Velcro to Strap Piece
glue the other velcro bit to the strap like so
NOTE: use the soft fuzzy part of the velcro on the strap, so that when you wear it, its facing your skin, when you wear it
Step 4: Put It Together in the Vice
Step 5: Done
you can use either the Velcro fastner or the belt buckle to strap it on or off your wrist.