Raglan Little John Mk.1 and Mk.2 rack-pinion gear - the gear that engages with the bed-mounted rack. This gear has a single-diameter shaft with a Woodruff key slot and a machined flat. It fits only the Mk.1 and Mk.2 Raglan Little John lathes (the Mk.1 Little John looks like this and the Mk.2 Little John like this.  If you need the rack-pinion gear for the Raglan "5-inch" it can be ordered here.