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I have two Jacobs Rubberflex Collet Chucks. One is a 91-C3, the other is a 91-C6. I would like to trade each of them for a 91-C5. Chucks have been disassembled, cleaned, and oiled. This is a one for one trade. I will trade one chuck, for one 91-C5 chuck. My hope is to end up with two 91-C5...

The D1-5 and D1-6 systems have different radii and different diameters for the pins. In addition the center alignment bevel is a different radius. I have included a PDF that describes many of the chuck systems and shows their dimensions.

Pictures of the 91-C3. I am disassembling the C3 to clean it up and lube it. It was a little stiff. I will clean up the 91-C6 too, but I didn't want to risk mixing parts. Like I said I am willing to trade each/either of these for a 91-C5.

Pictures of the 91-C6 uploaded. I also have a 91-C3 that I would be willing to trade for a 91-C5.

I realize that this post is ancient, but I have just acquired a d1-5 Lathe and a D1-6 Jacobs Rubberflex Collet Chuck, are you still interested in a trade?