This is an area where there is so much mis-understanding.
Hopefully this will help to put things straight.
We use this lock to EXPLAIN how and why locks work, how they can be improved and how to apply PLAYERS to make EVERY LOCK you do MUCH MORE effective.
Till you get this information correct, then you are losing out on making everything else work much better.
Take the principles here (very basic) and apply them to EVERYTHING that you do.
Then add in as many principles (Players) as you know to make everything even more effective.
Let us know what you think of the clip below: