Tom Balding Long S Hinge Port BitTom Balding Long S Hinge Port Bit8 1 4" Stainless steel Shank Hinge Port mouth with Copper Roller Stainless Steel dots Tom Balding's precision craftsmanship is highlighted in the stailess steel Long S shank with stainless dots. The mouthpiece is the Hinge Port with a copper roller. You get independent side action with the hinge port, great for lifting a shoulder or fine tuning alignment, when you lift one side alone. Lift both reins together and you