I have used the abbot Davis balancing rein just the rein and not the bit that ties to the tail. I swear by it. I had a horse with a back problem and another that kept throwing its head up. After having their backs checked I used this rein for hacking and they both rounded beatifully without any pressure on the mouth. The critical factor in this system is the lowering of the neck before the head bends. With the neck lowered the horse will bend naturally and emphatically, some from the poll, some not, but the quarters will engage and muscle building will begin with long lasting effect and happy results. I have owned my balancing rein for years And I get a lovely outline with no effort on my part And the horse carries himself beautifullyThe reason I am sending this post is to ask if anyone has one they no longer use I would love to buy it from you as they no longer make them. Thanks