First, please understand that there are two pieces (or sides) to your rubber strap. One is affixed at the lugs at the top of the watch (twelve o’clock) and the other is affixed at the lugs at the bottom of the watch (six o’clock).

To adjust the length of the strap, you must first remove the strap (both pieces) from the deployant clasp (not from the case at the lugs). It is attached to the clasp with spring-pins. You can use any small pin-like object to push the pin inward through the micro-adjusting holes in the clasp or the preferred method of using a small dull knife and wedging it from the backside between the rubber strap and the side wall of the clasp (right on the pin) and then pinching the strap and pin inward to free it from the pinhole. 

Then being careful to cut the rubber strap in a straight line, you will cut an equal length from each piece of the strap. It is recommended that you do this operation one “hole” at a time so as to not make the strap too short. (Caution: Once the strap is cut, if it is too short, your only option would be to purchase a new strap.) So to begin, you would cut the strap on one side by one hole and then on the other side by one hole. You do this so that the clasp will remain in the middle of the underside of your wrist. Depending on which model of rubber strap you have, the holes will be separated by either a groove or a “score line” so that it is obvious where the cut should be made. We recommend using an Exacto knife or a razor type of cutter to perform your cutting. A sharp knife will also do.

After you have performed your first cut(s), you should re-attach the strap to the clasp to try on your watch for size. When you re-attach the strap use the outer most micro-adjustable pin-holes. This way if your strap is only a little too large, you can further size it to your wrist by using the micro-adjustable holes on the clasp (rather than cutting it again). If the strap is still too large then repeat the process again by trimming the strap again (one hole at a time).

You may also choose to trim the strap by one hole on one piece only. If you do this, then you should remember to trim the strap sides in an alternating fashion so that the sides (pieces) will remain the same length (or at least close to the same length).