How do I install and thread welding wire in the Miller Matic 211?

To thread welding wire, first lay the gun cable straight and pull/hold the wire while cutting off the end. Remove the gun nozzle and contact tip, then open the pressure assembly. Push wire through guides into the gun while holding it, ensuring proper drive roll positioning. Feed wire to check drive roll pressure and tighten the knob to prevent slipping. Then cut off wire, close the door, turn on power, and press the gun trigger until wire exits the gun. Finally, reinstall the contact tip and nozzle.