I checked this out awhile back, because it's one of my favorite Fuzz tones, along with "Incense and Peppermints", Heart Full of Soul" and "Hello I love You" and of course, "Satisfaction". In a magazine interview I read somewhere, he said that someone build this fuzz into his guitar, and he played the guitar with his bare fingers to get it to buzz and sustain like it did. Kind of pulled it up at the end and let it smack the fret maybe. I was really bummed, because I wanted it to be a Tone Bender or something that I could build. My Si Tone Bender comes close, and the OUSB comes close. I would say that with a VOX amp and Rickenbacker with those boxes, it would have it nailed. I believe that the equipment these guys used along with their fuzz was the key, and not so much the fuzz its self honestly. We had a discussion over "Heart Full of Soul", which has that thin high pitched fuzz on it, and I believe that one was an original germanium Tone Bender, that also may have been Beck on it. I know they used Vox and Ricks and some Univox guitars around then.