This is the only piece of information on Chandler-Duplex Boring/Facing heads that I've been able to locate over the years. The Company no longer exists. As far as I know there is no source for replacement parts. I do have a few N.O.S. parts on hand that I intend to revere engineer and eventually have drawings on file for anyone to make their own replacement parts.
Ken (4GSR)
Ken (4GSR)