We had issues with the coach door lock on our Melbourne.
I called a locksmith, who I had used on the past and trusted.
Those locks are cheap cheap cheap, he told me. And replacements are too.
We decided this: He would remove the lock and examine it for damage. What had happened is that one of the five (?) tumbler tags had broken. Options were to replace the entire apparatus. Or reinstall if with only four tumblers. I chose the latter.
His advice was simply to insert and remove the key gently. Or regularly buy new locks.
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