Door Lock Lock (Customizable)

This probably needs some explanation.

First! This is not a lock in the conventional way. It does not increase the overall security, but prevents people having a key from entering.

It is more an adapter to turn a bi-directional door lock into an uni directional door lock.

In simple words, if you place this bracket from the inside, no one can unlock the door from the outside using a key. From the outside it looks like the key does not fit anymore, as it is impossible to turn it.

I am not a lock expert and have no clue how the internals work, but on my door the key on the inside rotates if you turn the key on the outside. (dual cylinder lock?) This is the requirement to use this bracket. It simply fixates the key on the inside, so you cannot turn another key on the outside.

Once you slipped it over the door handle, you plug in the key from the inside. The slot in the bracket allows to insert it, but not to turn it. Push the black handle on the bracket upwards and you are a