[Tynwald]

I don’t have a string diagram but recently finished work on a 29x, so might be able to help. If you look at the pics I’ve attached, you’ll see that the string starts with a knot tied onto a little tab on the tuning wheel, wraps around the wheel once then runs through a series of sheeves (pullies). There are a couple of them that I couldn’t get a shot of, but you should be able to see that the string heads back to the two springs attached to the wheel. It’s actually fairly intuitive if you study it a bit. It was easier for me as I had removed the entire tuning assembly for cleaning and took note of how the string ran (it was intact before I started). I had to hold the assembly in one hand as I strung the string through the sheeves. Don’t know if that makes things clearer or not. If you’re still confused, I can try to partially dismantle it and draw something that might make more sense.