Tag Heuer makes luxury watches that have bands with thick metal links and clasps. These watches are meant to be sized for the owner's wrist when they are purchased. However, the owner may lose or gain weight or give the watch to someone else and the band will have to be adjusted. While these bands can be brought to jewellers for adjustment, doing it yourself is cheaper and much more efficient.
Remove the link pins from the clasp at the end of the watch. This is usually done with a watch link pin removal tool, which is what jewellers use to quickly and efficiently adjust the band on these watches. If you don't have this, use the tip of a small screwdriver, like a jeweller's screwdriver. Once each pin is mostly out, grab it with needle-nosed pliers and pull it the rest of the way. Keep these pieces together in a safe, secure place.
Remove the pins from each link in the watch the same way you removed the pins from the clasps. If you are adding links to the band, carefully insert the pins through the new links and the holes where the clasp was previously connected. Insert the pins in the clasp until they are secure and then hammer them the rest of the way in. Add or remove enough of these links in the band until it fits around the wrist snugly.
Reattach the clasp and longer link pins in the clasp in the same way you have been attaching the links in the band. Try on the watch with the adjusted band to make sure it fits properly.
The buckle on the clasp goes on the 6 o'clock side of the watch.