I am very familiar with footage of Carlos Santana playing his red SG with P90s at Woodstock. That SG had a stop tailpiece and the short vibrato had been moved back to make room. I recently watched a video of the Tanglewood concert from 1970. In that concert, Santana is playing a black SG, also with a stop tailpiece and short vibrato, and the P90 covers are white. Was it the same guitar? It seems odd that there would have been two SGs with the unusual tailpiece and vibrato hardware. I read an interview in which Santana said he destroyed the red SG because it wouldn't stay in tune. Did he leave out a few details?