In factories a guard is typically placed over an exposed rotating shaft. This is because if you accidentally let your hand or worse, your long hair to get caught when a shaft is spinning at say 10,000 rpm your will scalped before you can even blink.
Understanding about the danger of getting your hand caught in a spinning shaft has given me an insight into how we can apply locks in push hands. In essence, we as the spinning sphere allow the opponent to put his hand into our turning body in order to get it entangled inside.
Below is a simple example of how to use a scoop and rotate action to capture the opponent’s arm :-
When trying to put a lock on a person you can expect resistance. After all, who in their right mind would allow you to lock their arm. This is where a feigned strike helps you to overcome resistance.
This looks similar to the first video above but the difference is that you capture the opponent’s arm deeper into your space. In this way he will have a harder time to get away.
Many times a common reaction to getting locked is to pull the arm away or twist the hand the other way. When you encounter this you should go with the flow and morph into another lock.
To learn how to change from one lock to another you can practice looking for or creating opportunities to lock even as you are moving from one position to the next.
Opportunities to lock can suddenly appear. So knowing the principles of locking can help you to recognize an opportunity when you see it. A cross lock is not something I was looking to use but it just came up and we ended up working on it too.
You can watch the longer clips of my student learning to do locks in my Youtube channel here.