I bought this cartridge because I needed something for my jet mini. I think I was too excited about the price and didn't read the page like I usually do, overlooking the fact that this cartridge is plastic. All plastic. And I'm pretty sure it's not self-centered for what it's worth. I couldn't screw it to the jet so I couldn't try. I was really hoping and looking for a 3 or 4 jaw chuck that would be self centering and stand up to my use. I will search. I heard Psi has a great mini cartridge. If you have a Proxxon micro lathe, this chuck might be perfect for you.
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