Dave,
That helps tramendously. That sounds like my problem exactly. I'll take the barrel out and see if it's 1/8 or not. I can lean lean lean and it still idles rough and never speeds up like it should. And, like you, I felt like the air bleed screw was about to fall out.
Of course I use a filter, and to me this has been a problem since I first started it, and it was brand new.
Thanks again...