I tried the friction ball till my fingers went numb, but the fu#%er didn't budge.
I searched the web but I keep getting a tun of friction ball movies.
Other then rubbing my balls on it .. is there something else I can do to get it to open?
Use a hot glue gun.
Put a blob of fresh hot glue onto the caseback.
Push a piece of flat steel bar (piece of bracket, hinge, tool etc) firmly onto the blob of glue.
Wait until cool and use the steel bar to open the caseback.
After opening and closing, the bar can be pried from the glue and the blob of glue will peel off leaving the caseback clean.
I find that if the glue is at it's hottest, this method works EVERY time.
No luck required. .
If you are honest, people may deceive you. Be honest anyway!