I have used the a Tormach so know about that collet system although I don't know exactly how the drawbar works and it's been a while. This one has a R8 collet with taper on the lower end like a typical one although it may not be original to the machine.
This is a stock system as far as I can tell. Don't see how it could be for a mist system. The drawbar isn't attached. Once loosened it pulls right out just like a simple, manual drawbar. It has a plastic cover (again that looks stock) - will have to see if that can be easily removed. I may apply some air pressure and see what happens. The mill has a Yuasa tag with no model number. I sent a request to them with pictures for more info but it looks like about 1980 vintage and nothing like it is on their web site so I may not get anything from them.
Here's a pic. It looks like if the hose is removed the cover can be removed to see what's inside.
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