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The MB 04 is similar to the MB 02 in that it will rotate on the tongue and apply tongue pressure, however, it has a small (¼") port that introduces some tongue relief to the horse. The port allows the horse to swallow and move his tongue when he is moving forward and relaxed, which acts as a release or reward. The mouthpiece is curved, and it wraps around the bars and lips instead of pinching. Sweet iron mouthpiece oxidizes and encourages salivation.
The MMB shank is an indirect (curb) rein action designed to be used with the curb chain which is attached to the purchase. The MMB shank uses the combination of the fixed cheek and fixed rein to apply pressure to the mouth, chin and poll. The MMB’s innovation is the sliding action of the mouthpiece. When the reins are engaged, the mouthpiece moves, giving the horse the opportunity to respond to the lightest signal before the mouthpiece hits the stop. The distance the mouthpiece can travel between the stops means that this cheekpiece will not apply very much downward pressure. The design of the mouthpiece attachment does not allow the mouthpiece to slide as readily along the shank giving it a more solid feel than the HBG. The patented Neil Merrill purchase plate disperses pressure evenly against the horse’s face.