06/11/2023
Why Tom Thumbs shouldn’t exist.
All bits fall into 2 categories- snaffle or leverage. Snaffle means no shank and has NOTHING to do with the mouthpiece. A Tom Thumb (pictured) is a single jointed mouthpiece with a shank.
A shank dramatically changes the action of a mouthpiece- just because this mouthpiece might work on your horse as a snaffle does not mean it will work on the same horse as a shank. A lot of bit manufacturers make Tom thumbs and a lot of people buy them- but that does not make them a good quality bit. (it just means people don’t understand the mechanics of a snaffle versus a leverage bit.) Because many horses go well in a single jointed mouthpiece, people, assume adding a shank is a good idea, but nine times out of 10 it just makes the horse twist their head funny. The other 10% of horses just tolerate it, but would still do better with something else.
If you want to try a shank bit, (and some horses just honestly do go much nicer in a shank) I would suggest first trying a rotating cannon style mouthpiece instead. Myler makes nice ones. They don’t twist a horse’s head the way a Tom Thumb does. They almost act a little bit like a slobber strap until the curb strap engages, meaning they have a little bit of a pre-cue, which is nice. Or even more ideal is a go straight to a solid curb if you and your horse are ready.
Historically the only two bits people used were either a single jointed snaffle (which is why it’s now common for people to think that “snaffle” means a single joint) or a solid one piece curb. They both had very different actions for a very different purposes. Both designs were good at what they were intended for. now people try to be clever and combine the two without really understanding the action and purposes of each, which were really never meant to be combined (unless we are talking about a double bridle wear a horse would wear both at the same time.)
A Tom Thumb is like someone looked at both a car and a plane and thought they were both fantastic, and decided to try to build one contraption that was the best of both, without understanding how either one worked.