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If you wish to sink b into the shaft use a spade bit 1st to drill a hole to fit then drill the right diameter hole to fit the bar . as its square use epoxy putty to attach it it will infill any gaps made by the straight edge of the door knob .It will make it stronger to infill any gaps caused by this .There would be no need to drill another hole into the shank to secure the handle with a screw the epoxy will do it. As theres some play on the door handle shaft the epoxy should help in alignment if its not quite straight as well . It shouldnt be a problem i do all my fixtures using hand eye .