Ok, I am confused. If you're planning on tying the twine directly to the saddle, how does that have any give in it? And if it's a long piece of twine, it's going to do nothing anyway. If you're going to do it, go with kevinshorses method.
I said nothing about tying it to the saddle anywhere. I said tie his head around when I initially suggested it. That could have been in kevins method by tying it to a stirrup, or by tying it to a d-ring, or the saddle horn. My point was that if I used a decent sized string, it would be taut, but not completely rigid--the same as if I were to use the reins.
Regardless, I've gotten some great stretching/massage suggestions from the book that I bought (they all seem to target the head and neck area so we can loosen him up) and then lead into working under saddle and teaching correct bend with pole weaving and possibly going around some scary barrels and cones.