Tell us about yourself!
Flip the mouse over. There should be a black "V" shaped sticker at the bottom. Peel this off and underneath are 2 screws. undo them to open your mouse up. However, these mice don't have a spring or any of the other stuff shown in the article so you can't do it anyway.
I found this project very easy. I made two of them in less than 15 minutes. I didn't use glue so I just twisted it until it worked :D (btw the one shown in the pictures is just the first one, as the second didn't turn out so good)