Seiko Watch Back Removal Tool - Used to replace your battery!

I recently inherited a Seiko watch and the battery was dead. I don't live anywhere near an authorized Seiko dealer so I went to youtube to check out how best open the back of the case.... after watching a youtube video where the user used a hammer and screw driver to remove the back I figured I could do better than that!

I'm not sure if this will work on all Seiko watches. My watch has the designation 7T32- on the back and it works great with that one! Just align the nobs on the tool with