I've finally managed it. It isn't easy when you only have a crude rope and plenty of baize. The weight is unevenly distributed.
I have finally devised a way of doing it, though: I hold my scrotum, or the stretched skin below it, with both hands and this seems to take the strain better. I do not hold or touch the rope; in other words, my balls are taking all my body weight.
This is the second time I've done it this way. I can hang by my balls, literally, like this for over a minute.
I'll try and take a photo with flash and using a mirror; I'd really need a professional shoot, though. If V is sober, I'll try her again.
It's a great feeling, the intensity of it and knowing that a man's balls cannot be stretched any further - it's the ultimate.