Butler 550, 570 & 460 Lathe (also badged as the Elliott Concord 550, 570 & 460) - also covers the model sometimes listed as the 560 and 570: Illustrated Parts Manual as Exploded Assembly Diagrams.
Butler (Elliott) 550 Lathe (also badged as the Elliott 550, 560 and 570): Instruction and Maintenance Manual. Includes a copy of the maker's comprehensive Technical Sales and Specification Catalogue and clear diagrams of the often illegible Screwcutting and Feeds Chart.