I bought this lathe about 30 years ago. I have made lots of parts on this lathe. The problem is I can't cut threads on it. The gear arrangement is the same as in the photo posted by Thenrie. There is no number on the lathe. Where the two gears off the quick change for the feed rate of the tool is with two 48 teeth mine has one 40 tooth gear. I set up a dial indicator on the carriage and set the lathe for a 13 threads per inch cut. I engaged the threading lever (with the motor not running) and turned the head one revolution by hand. My travel was .050 and it should be .07692. The 24 tooth gear is on the shaft. I have the manual that came with the lathe. Am I right in assuming the 40 tooth gear is wrong and I need two 48 tooth gears to make it travel at the right rate to thread?