"Davide" wrote in message
...

snip

Do you have any suggestions for a locking device to be attached to the
garage door.
We don't have the key to the mechanism. I could replace it if I knew who
the
manufacturer was but i don't. I wonder if the locks for sliding doors are
all standard size.

The handle mech is probably held on by just a couple of set screws through
the door. If you take it off and go a locksmith, they'll almost certainly be
able to supply a new locking handle, or possibly even just a new insert for
the handle.