I have a lock for a graphics connector on a computer/projector for which I have forgotten the code. Is there an easy way of opening and resetting the combination please? I know the easiest answer is to throw it away and get a new one but ...

A shim would seem to be the answer but I can't see a way to get access to do that. Any suggestions please?
It is a Defcon PC lock with 4 digits. I think it is made by Targus but can't be sure. It is several years old.
I have taken some pictures to see if they help at all but can't see how to load them here
