How do I replace the contact tip on the M-10 gun?
Turn off the power source before replacing the contact tip. Cut the welding wire at the contact tip, remove the nozzle, then unscrew and remove the old contact tip. Install a new contact tip and reattach the nozzle. Make sure the contact tip matches the wire diameter being used. (Page 27)
From the official Miller Millermatic 211 Auto Set manual, page 27
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