Here are some post for modding watches:
DIY : Bezel Click ball repair & replace
DIY : How to remove and replace cystal
DIY Crystal and chapter ring removal ...
DIY : Seiko 3 & 4:00 movements Dials & rings
DIY : How to remove and replace cystal
DIY: How to remove a Seiko 7s26 movement
DIY : How to tell a 3 or 4:00 movement