Do you have any runout when using the chucks? I'd mount the sleeve on an arbor mount a center and center it in a four jaw chuck and using a dog to drive I'd set up a grinding fixture on the tool post . Indicate the compound to the taper and then using a seperate indicator on the bottom of the compound. Then I'd take a test grind full length of the taper. If it cleans up all the blue dye I'd loosen and tap the compound about .002 at the tailstock end. Recut the grind measure the large end if it matches the taper in the head I'd stop and recheck the fit in the spindle. Easy to save your zero by just taking the arbor and part out from the centers. Remove the chuck and Ck the fit with blue dye. It may take awhile but you can fit it a few thousandth at a time. If the spindles out you'll need to recut the bore. Hopefully it's just the sleeve.

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