Rolex is a Swiss watch company and the leading manufacturer of luxury watches in the world. Rolex watches, unlike most watches, have screw-in pins. Pins hold the watch links together and must be removed when resizing the watchband. Most watches have pins that are simply pushed into the links. Removing a link, which shortens the watchband, is a simple process, but you must be careful not to scratch the band in the process.
Set your Rolex on a soft cloth so it does not get scratched.
Look on the edge of the links closest to the clasp. You will see a tiny screw, which is the pin head. Only the four or five links on each side of the clasp have a removable pin.
Place the tip of a jeweller's screwdriver on the pin head and carefully unscrew it. You can remove any pin on either side of the clasp. Once the pin is unscrewed, use your fingertips or a pair of tweezers to completely remove the pin. You can find a small screwdriver in a hobby or jeweller's kit. Repeat this step on the pin next to the one you just removed. You must remove two pins total.
Remove the loose link from the watchband. You will have one extra link and one extra pin. Set them in a safe place in case you need them in the future.
Reattach the watchband by sliding the two loose links together so that their pin holes align. Insert the pin into the empty pin hole and push it down gently, then screw it into place. The pin is completely inserted when the pin head is flush with the edge of the link.