The Feeler FTS-27 in its "Second-operation", "Capstan" and "Plain-turning Precision" forms was a copy of the Hardinge DSM-59.
The following is very useful: HARDINGE DSM-59, DSM-59R and DV-59 (also advertised as the "DSM five-nine" and also applying to the HSL-59 short-bed version) - all these lathes were identical save for the equipment bolted to the bed. e.g. a tailstock and compound slide rest produced the Super-Precision plain-turning DV-59 and with a turret head and cut-off slide and other equipment the DSM-59 "Second-operation" Model. A complete data pack for the lathes with an Operation & Maintenance Manual with two comprehensive (and beautifully illustrated) Technical Specification and Accessories Catalogues for the DV-59 and DSM-59