I am being offered a 103,xxx Mark VI that had its original neck replaced (by the original owner) with a Balanced Action "T" neck. This unusual (to me) neck has a significantly raised octave hole, thus the "T". I'm told the BA neck provides much better intonation than the original. The horn plays beautifully. However, I have done much searching on the web and have found no mentions or photos of such a BA "T-neck." Does anyone know anything about this? Appreciate any and all thoughts.