In order to provide a simple and inexpensive longitudinal feed to the carriage it appears that some AA "Craftsman 109" lathes were fitted not with changewheels but a double-reduction belt drive powered either by a pulley on the end of the headstock spindle or a jackshaft (countershaft) assembly. The mechanism used a boss cast on the back of the bed (not all 109s were so fitted, however) to mount a double-step pulley that transmitted its drive to a similar pulley on the end of the leadscrew. Some aspects of the conversion, especially the leadscrew clasp-nut arrangement,  have an amateur appearance and no mention of the machine can be found in any Pre WW2 Craftsman catalogue. However, during 1940 and 1941 the lathe was advertised in trade publications as the $27.50 New Model No. 40 Armature Lathe - with several examples coming to light in recent years carrying the remains of an oval badge proclaiming: Sherman Clark Mfg. Co. of Jackson Michigan (USA) or alternatively Zoerman-Clark Mfg. With the town of Jackson only 35 miles south of Lansing  (home of the AA Company), there would have been a tie up between the organisations with Sherman Clark realising that a power-feed attachment would make the lathe so much more useful and commissioning a batch from the AA company for subsequent modification and sale under their own label. The basic specification was a 26-inch long bed, a capacity between centres of 18 inches a 6-inch swing and a 360° swivel top slide. As shown in the advertisements there was a bolt-on quick-action lever feed to the carriage, the connection to the carriage being by a piece of twisted flat steel plate. Only one (incomplete) example of this mechanism has been found so far.
The badge was applied to rather roughly-finished castings and, whilst not absolutely distinct, appears to be laid out with the maker's name across the top on a red background, "Garage Equipment and Tools" along the bottom and, on a yellow background: "The Right Tool For The Job" across the middle with the words Jackson above and Michigan below. 
If you have one of these lathe the writer would be interested to hear from you.