Abstract: Assembly apparatus for simultaneously rolling opposed toothed metal connector plates onto both sides of horizontal wood 2.times.4's or like structural members. The apparatus is applied to assemble trusses wherein a prefabricated wood frame of chords with end and intermediate spacers is fed between parallel vertical axis powered rollers with V-webs manually applied to each side ahead of and as the frame is compressively driven through. Similar apparatus is employed to splice the ends of wood chords for use in trusses or otherwise.