(Picture of actual Gearbox Mechanism removed from the door) The Newcastle Locksmith had a callout to a gentleman whose lock was sticking and causing problems opening and locking the door. Our certified Locksmith attended the property to find that not only was the lock sticking but the mechanism was also on its way out. This was fortunate because a failed gearbox mechanism would be a more expensive repair. Upon further investigation it was found that the hooks in the locking s