I used about 4 plies of panty hose on my first build stretched tightly over and done trimmed neatly with a cable tie or rubber band. Had seat post carb clearance issues. This ditty let my porting and carb breath really well.
Just walk into the grocery store like you have more energy in one led than the other
and get some there only about 5 bucks at the most and you will have like two good filters out of it. They even come in assorted colors could get that Cyndy Lauper look.