How do I thread welding wire for the Roughneck gun?

Lay the gun cable out straight, then open the pressure assembly and cut off the end of the wire. Push the wire through the guides into the gun, then close and tighten the pressure assembly. Remove the gun nozzle and contact tip, turn the unit on, press the gun trigger until wire comes out, then reinstall the contact tip and nozzle. Finally, feed wire to check drive roll pressure and tighten the knob enough to prevent slipping. (Page 21)