I read Omega manual but it is not clear to me on how move the clasp's notch to another the hole to make the strap size smaller. o| I assume I need to move the 2 sides of the clasp to detach from the strap side with holes? I tried to find video on how to do this but I couldn't. Could someone explain this to me or point me to the video? I hate to mess up the strap and/or the clasp. Thank you for your help.