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The curb chain applies pressure to the curb groove under a horse's chin when the curb rein of the bit is used. When the curb rein is pulled, the shank of the bit rotates back towards the chest of the horse and the cheek (upper shank) of the bit rotates forward (since it is a lever arm).f used with a loose curb chain, it allows the shanks to rotate more before the curb chain is tight enough to act as a fulcrum and exert pressure. This extra rotation can warn the horse before pressure is exerted on his mouth, so he may respond beforehand.
Take the rag in your palm and wrap it around the chain. Hold on tightly. Turn the cranks a couple of times while holding the rag around the chain firmly. This works best if you hold the upper portion of the chain, the one that's closest to the saddle (seat). After applying the lubricant to the chain, you may want to gradually shift through all of the gears so that they are all well-oiled before the ride too. 2  Get a thin oil, such as bicycle chain lube. 3  Avoid the thick, greasy type of lubricants.