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The company that I started out in, back in 1965, made belt conveyors. All of the pulleys that the belts ran on were equipped with "Squeeze-Lock Hubs". That is an old design, that's been around for a long time.
The new Fenner Taper Lock bush was fitted onto a precision parallel mandrel in the headstock chuck, then the cross slide back face was pressed to the face of the tapered bush without any undue force Derek