Gawd! bleedin DG doors
Assuming it was a euro cyinder you might not have been able to open the
door even if you had a key, often a key left in the lock on the inside
stops a key inserted from the outside from unlocking the lock.
I've just come across this with the new doors the landlord's just had
fitted. Bloody annoying. Something to check when I buy new door locks for
the bungalow...
Same as an ordinary mortice lock, then?
Nope, totally different mechanically.
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