"Jim is correct. You adjust a Shubb before clamping it on the fretboard! I don't believe they are designed to be adjusted in place. If it's too loose you undo it, tighten the screw a bit and re-clamp, and vice-versa."
"Looks like a real sweet guitar with just about all the specs I've come to prefer, but I just can't get past that 3 piece back, especially with the wood grains perpendicular to one another. Would prefer this with just a standard back…"