Lever action ER collet chuck - video

Lever action ER collet chuck. By ollysworkshop. 9:31 video:

https://www.youtube.com/watch?v=NUMWaofXYno

That would be a great addition to a production machine. I really like that.

I understand the traditional method of Belleville washers securely holding a toolholder in position located and driven by the spindle taper and drive keys. But not solely supplying enough clamping pressure to a friction collet to clamp a tool or workpiece on the diameter.