My mare DOES NOT LIKE the simple snaffle, she thinks its a toy and just plays with it with her tongue, Yes she can be ridden in it, but she would rather play with it, she just has that kind of personality and it seems to be too light for her to really care about my cues. As for the tom thumb, it seems to be too heavy for her mouth, too much pressure on her tongue and bars. So that's why I asked about the chain bit, if I should consider trying it on her, since she seems to be my difficult horse. I'm terrified of hurting her mouth so I use little contact on her mouth when on her back, she's getting the neck reining thing down as well as seat and leg aids. As for on the ground, I lunge her some to get her to understand the idea of having it in her mouth for steering and gentle control. I do not wish to become my grandfather and break her the harsh and hard way, damaging her spirit and overall her mouth, making her hard mouthed and difficult to handle after a while.
I did not mean to cause such a huge debate on this subject. I've had the pleasure of riding a beautifully finished western horse, it was like riding with an invisible connection.