Using Card to “Slot-Open” a Door Lock is actually a Myth. Locksmith’s Insider Secret

Kuching Locksmith Knowledge Sharing
By Fine Lock Shop

When you accidentally locked the door, and left the key still inside, what is the 1st t hing that you will think of?

Try use a card to ‘slot’ open the lock. Actually everyone that i met, up to now, have all thought that the knob type of door lock can be just card-slot to open the door. And this is actually ‘fake news’.

Knob lock or cylindrical lock, are designed to be not slot-able. Whenever you seen or heard people manage to use card to slot open a lock, is actually due to: IMPROPER INSTALLATION. When the lock is not properly installed, it will expose a weakness which is slot-able.

Let me teach you now how to properly install a knob lock.

First you need to understand that cylindrical latch, has 2 parts: The Latch itself, and a Deadlatch.

This must be the first time you have heard of deadlatch. Maybe this is the first time you notice it. But it’s extremely important. If the deadlatch is pressed when the door is closed, the latch will be ‘deadened’. Hence the word DEAD-latch. So in a proper installation, the deadlatch is always pressed and can’t go into the door-frame hole.

When you (or someone else) do the installation, you need a hole at the door frame, for the latch to go in:

When you are measuring this hole and aligning this hole, the deadlatch CANNOT go into this hole, as shown below:

Another photo below here to show you the 99% of installation that we saw (the wrong way)

The main culprit is at the door frame hole (strike hole). just make sure that the deadlatch won’t go into hole. And this will guarantee your installation to be of higher security, and no one can just swipe a card to go into your house/ room.

Lets Keep Our Families Safe.