Thanks Ernie for saving my butt on that one. I really have no idea about part number or manufacturer. What I heard from the tour guide at Robinson was that they have to make their own since nobody would cooperate with their requests for this special need. The cup is bell shaped made from two cups cut apart and the top of one and bottom of the other mated back together. The smaller side threads onto the collet body and the larger leading to the work. I think they also put something like scotchbrite in there for a gas diffuser. These cups "look" like the ones in the PDF except that the larger side goes toward the work piece.
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20 years ago