The HLV-H taper attachment works with the normal cross feed screw.
One reason to replace screws and nuts on a new machine is to change from inch to metric or vice versa. Did you determine if your parts are 10 TPI, or might they be metric?
The cross feed nuts are drilled and tapped while mounted in the machine. New replacement nuts are not drilled and tapped, and you need a special kit with drills, bushings and tap to install a new nut. That way, when the dovetails are scraped, changing the relationship between the screw bearing bracket and the nut, you fit a new nut and the screw will line up with the nut threads. So a nut from one machine may not quite work right in a different machine.
Larry
