Changing Mondaine Straps – see quick steps below:
Step 1. On the reverse of the strap you should see a succession of ridges. You will also notice a corresponding ridge on the clasp. Sounds obvious, but once you have decided where the clasp should reside on the strap, you need to align these two ridges.
Step 2. Get a piece of string or ribbon and wrap it around your wrist. Snip the string so that one end meets the other and measure this diameter.
Step 3. On the other end of the strap you will see the hook which goes over the clasp – you will see the next picture. From this hook the measured distance will be where the end of the string lies.
Step 4. This is the tricky bit! Insert a small screwdriver into the hole on the main clasp part, from the right hand side and bend it down towards the strap thus opening the clasp. Do not insert a tool from the left side, under the clasp and use the bar as a fulcrum; you will bend this rod and the watch strap will not hook over it. Move the clasp to the desired position and gently locate the ridge nearest the position. Once located, press down on the open clasp until it clicks into place – voila!
If you wish to see these instructions with pictures please follow this link: How do I adjust a mesh strap – copyrighted information from the Mondaine watches website .