the pins in the links are a push fit design. 1 end is flat and the other end has a hole in it. a special tool exists that i use at work but you can use a sewing needle and small tap hammer to push the pin out from the hole side. be sure you hear a click noise when you put the pin back in though, otherwise the pin isnt in fully and the bracelet may come apart. you could always just take it to a stockist of j12s, should only be £10 or £15 charge. good luck
graham
April 2008