you dont need the pentagonal wrench to get the gas port/adjuster off.
that would need to be done in a "detail strip", not a "field strip".
anyways, the easiest way (without buying the 20 dollar pentagonal wrench) is to use a CRESCENT WRENCH. See how the gas pot is SQUARE? You can get some little wood pieces, put on both side of the square part (so as not to damage metal) then twist it counterclockwise and the gas port will come loose. You can take it all the way off if you want, but just loosen it, then you can manipulate the gas port adjuster with your fingers, turn it to the setting you want, then tighten the gas por back up. THAT'S IT!