I've got a MM-180 for my regular use and run .023. (.045 in the M-250 for heavier stuff ) the best way to setup the rollers is to pull the trigger and let the wire run into a solid object, ( ie: the floor, and piece of lumber etc ) and tighten the rollers until it starts to drag from the pressure, right before it starts to bind. Then back off 1/4 turn. This should be close to the best amount of tension to feed properly and not birdnest, and the extra 1/4 back will give you a touch of wiggle room in case your liner kinks, spatter build up, or worst case a glob of molten metal gets on the tip and closes it off
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