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

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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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