Rubber watch bands are very durable alternatives to leather or metal watch bands. Whether you just purchased the rubber watchband or you have had it for years, it is very likely that there will come a time when you will need to resize it. Resizing a rubber watch band is most commonly done to adjust the way the watch fits, but it can also be used to tighten or loosen the band according to personal style preferences.
Remove the buckle. Depress the spring bar with a spring bar tool. Push down slightly on the spring bar with the forked end of the spring bar tool. With the spring bar depressed, disconnect the spring bar from the buckle by pulling one side free with your hand.
Cut the band to size. Use scissors to cut along the grooves along the spring bar conduits, being careful not to cut the spring bar conduit. Remove equal amounts from both ends. For bands that do not have a removable buckle, cut the end without a buckle only. In the case that there are not any grooves on the buckle, cut a straight line using a razor blade and a straight edge.
Replace the buckle. Connect the buckle by placing it on the ends of the band. Align the holes of the spring bar with the band conduits, and insert the spring bar.