I just sold and had returned a 2005 Pedulla Pentabuzz (on Reverb). The buyer said the neck was twisted so that the treble is bowed and the bass side is not, causing buzz and deadening in the higher and lower registers. I played it and set it up before selling it and it seemed fine to me but I`m sure he didn`t make it up (I take returns for any reason). I can kind of see some bow down towards the bridge but it doesn't seem like enough to worry about. I`ve loosened the strings and put the truss rod to neutral to let the thing rest for awhile before I re-adjust everything. Anyway, I`m wondering when is a neck twisted enough to be a problem? (can`t see myself sanding down this kind of fingerboard). Thanks for any input.