1.Using a Spring Bar Pin Watch Tool to remove a link, which is fixed band and watch case at the hollow side
2. Using a tool to pull the link to the hollow direction, force the link separate from watch case
3.To fix a new band
First fixed the link ( the one in the band side without hollow ) to watch case . Secondly pull another side link ( the direct is same to step 2, pull the link to hollow direction ) to match its slot. All works will be done if you finish this part.