In some cases locks do fail or break, and it is important to replace them quickly and correctly in order to protect your office. The first thing that the locksmith will do to install a new lock is remove the current lock. For deadbolts the apparatus is disassembled by unscrewing, but door knob locks are more complicated. Commercial locksmiths will have other necessary tools for door knob locks, such as a catch tool, a spanner, and a plug follower (sometimes referred to simply as a follower).
The catch tool is used to remove the knob or handle from the lock. To do this, the handle or knob must be twisted until the hole in the knob rose (the sheath-like case usually attached to the wall) is seen. The catch tool is place in the hole to release the catch, and the knob and rose can be separated.
The rose and spindle (the rod connecting the lock on one side of the door to the other lock on the opposite side) will be removed from the door. The bolt will also be replaced by unscrewing the bolt guard (also known as housing) and removing the bolt. Once this is done, the holes may need to be adjusted depending on the difference of the new or desired lock.
The reassembly is a cautious reversal of the disassembly process, with special attention kept to the fitting of the internal mechanisms. With the new lock installed, the business owner can rest easy knowing that their locks will open and close as desired, and keep the building and its contents safe.