I dont want to cause anyone to slap me, but, I play Bb like so, first finger on first string, first fret, second finger on the 4th and 5th string in the 3rd fret, and, third finger on the second string in the third fret, thumb on 6th string in the first fret. Either muffle or avoid hitting the 5th. I find it easier to do on the Taylor because of the thin neck. Sometimes I play with Bluegrass folks, and when they all use a clamp to play F, I like to play it natural and watch them look at my hand to see how I'm getting that low note. When the arthritis is acting up, I too use a clamp.As far as Eb goes, I dont think there is one on my guitar.