30 or 35 flux core ??

I'M using a friends Clark ( harbor fright) mig. It said I could use 30 or 35 wire do I have to change anything? Or can I just run different size wire in that welder??? Just by change the spool of wire??.. I get you videos and really learn a lot THANK A LOT...Randy Ski


The drive rollers sometimes have grooves for each and just need to be flipped to the right groove.

Also, the right size contact tip for the size of wire used .

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