So, my old Ram's Head has these aluminum knobs on it that I have yet to see on another Muff. Would these have come off of something else? Could they be original? Ive been through tons of info and history but never saw knobs like these. I assume they are added but it would be neat if they were some rare knob or something. It's a monstrous sounding pedal btw,very cool. Probably one of my most prized possessions.