The feed rod generally sticks out the far end of the bed.....rig up a drive from it to a small leadscrew on your threading apparatus,maybe repurpose a small topslide for a limited thread length......Near every lathe Ive had I rigged up a feedscrew drive via a uni jointed shaft to power a topslide ,extra slide ,or a threader....and while you are at it ,make a small thread milling attachment ,very useful for coarse threads.