What is the difference between a snaffle bit and a tom thumb bit?
A snaffle bit is any bit that attaches the reins in a direct line with the mouthpiece, or cannons. The mouthpiece is called the fulcrum. So, if when you engage the reins, they make a direct line from the mouthpiece of the bit, through the reins and to your hands, you are using a snaffle bit. The mouthpiece may be any of several varieties, including joined and solid. A curb bit involves leverage…it has levers that considerably increase the forces applied against the fulcrum (mouthpiece) of the bit. The levers are called the shanks and the purchase. The lever that extends downward from the mouth is called a shank, and the one that extends upward from the mouth (attaches to the bridle cheek) is called the purchase. The total length of that lever determines the amount of multiplied force placed on your horses mouth every time you engage the reins. In order for a shanked, or curb, bit to function without over-rotating the mouthpiece (fulcrum), a curb chain or strap is required. It stops t
