wasnt sure where to post this and thought this was the only place really, i have a adidas watch and wanting to change the battery and add a couple of links to lengthen the strap abit, so i need a tool to open the back of the watch to change the watch battery but not sure what tool it is, any ideas ? also i need a tool of some sort to change the links, its a metal strap with pins going threw it so im presuming there will be a tool to push the pins out from one side, then add the extra bits and push the pins back in, but again not sure which tool i need, anybody shed any light on whats needed please ? thanks