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This chuck key is designed to rotate freely until the ideal handle position is found. It can rotate ccw and lock cw for closing the chuck. Pushed down it will rotate cw and lock ccw for opening the chuck.
https://youtu.be/UPMqLX_OUCI?si=Mdxd0A50zt7kC0gf
If I need to adjust the lathe chuck a long way, I use a speed handle.
https://www.amazon.com/Performance-T...007UTQ2Z6?th=1
The most popular method for quickly moving the jaws is using a cordless drill with a square end piece in the chuck. It allows the scroll to spin when the jaws are removed and give it a blast with the airline using your other hand.