Somebody's had a go at this, have they not? I'd be inclined to disrobe another of your decks and arrange them side by side so that you can see what's been changed and what hasn't. The light bulb mod may be for excess take-up torque on small reels at high speed - the Studer C37 did something similar, to good effect, so that's one thing I'd not chuck out without seeing if it works. Lord alone knows what the sticky tape is doing round the capstan, unless the Ferro stepped pulley is the wrong size - after that crude transplant, a little extra vulgar engineering would scarcely notice
