While checking the G-Shock forum on Watchuseek I found this video in which, amongst several other tools, a multitool is used to repair a watch. I think it is a Leatherman, but I'm not sure about that.
http://www.youtube.com/watch?v=2L0g7zNVWQo
http://www.youtube.com/watch?v=2L0g7zNVWQo