The lead nut mount is the angle stock with two 1/4" holes for attaching to the sliding element, pair of 3/16" holes for mounting the coupling nut clamp and a pair of 3/16" holes for mounting Delrin ACME nut.
Aluminium angle, 1"x1", 1/8" thick
Make the angle piece from SVG or PDF template, according to the instructions in Howto section