Referring to the wiki article: http://mygshock.com/wiki/Repair_and_Disassembly#Removing_the_Buttons
I've been trying to figure out which side button to buy to repair my G-shock (GW500A). I've found listings for two different side buttons (2H, 8H and 4H, 10H) but no explanation of which goes were. I'm sure this is one of those things taken for granted by the experts, but I finally found an eBay listing that clarified that 2H means the 2 o'clock position, 4H the 4 o'clock position, etc. I think it would be useful if the wiki article made that clear for others. It is the first thing google pulled up and it would have saved me hours of searching.
Nice site and lots of useful information overall though. Thanks for your efforts.