Hi David,
Thanks for telling me it's 'house manual' I need to look in to make the change. Will do it now.
A far as the deadbolt: I wish! But in Berlin the apartment buildings have 1 communal front door and no way to individualize an entry for someone without giving them a key, which is difficult when people arrive at all times of the day and the night.
We are thinking of a lock box on a nearby fence, but are anxious it'll be cut off by the Municipality or property owner; our keys are worth 200 euros.
One idea we had was to put a lockbox on a bike and lock the bike up.
I would very, very much welcome any thoughts or suggestions on a solution.
Thanks, Abi.