I pulled the rollers off. There is nothing else stamped on them so I'm guessing both grooves are the same size. It's currently loaded with .030 wire with the .035 rollers. Seems to feed.
I ordered .023 rollers from Miller today. $36.95 after tax with free shipping to a dealer near me.
The dealer has all the parts for the Tweco gun. I bought enough today to get going with the .030 wire. I'll get some .023 tips and wire when I pick up the rollers in a few days.
The last question is the liner. Many people are saying one liner is fine for .023-.035 wire. They do sell .023 liners and I read a few posts about more consistant feeding with the smaller liner. Something about less snaking inside the liner. Do you think I will notice a difference with the larger liner?