Jacobs Rubberflex chuck runout

Friend of mine wound up regrinding the collet taper on his to get it to run true. He had a tool post grinder, so it wasn't a huge deal, but it did take some fiddling to get it down to zero (or near zero) runout. That was some years ago, I don't think he even has that system anymore.
 
Never mind, I see you had the same chuck running true on a different lathe. Its probably a good idea to start with measuring runout at the adapter plate.
 
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