Okay, I already feel stupid, so please don't pile on.  Got my 5 year old Century Tantal out of the safe today & cannot, f/the life of me, get the dust cover off.  Yes, I pushed the lock button on the rear locking tab down all the way-several times.  I've tried everything, up to & including a hammer, but no luck. Is there a step I've forgotten?  I don't want to mess the cover up any more than I already have, so I'm asking f/ideas & solutions here.  BTW, I don't remember ever having this much trouble w/it before, altho it's probably been @ least 2 years since I last took it out.  Any help is much appreciated in advance.
                                                                                                                                               Donzi.

Never mind.  I'm really an idiot.  Problem solved.

You didn't even give us a chance to pile on lol