Been fighting with my Millermatic 185....

I was getting irregular wire speed and at last found,, that who-ever put the new wire spool on the spindle,, didn't remove the label,, just pushed the label over the spindle,, trapping the label inside, between the spool and spindle, causing it to bind irregularly,, kept turning up the feed tension,, didn't help.. cleaned the label outta the spool hole,, viola..

hope it helps.