the.com/auxiliary lock
the deadbolt that assumes your regular lock is a gullible optimist.
means a supplementary locking mechanism added to a door for extra security beyond the primary lock.
from rose alongside urban crime spikes and rental housing, when tenants without keys to change the main lock needed their own added protection.
common formchain locks, deadbolts, or door bars
landlord loopholetenants install without altering primary lock
insurance anglesome policies require one for coverage