To recharge it, you use a Hitching Rope, made by a Tinker but the Tinker must have 15 Animal Lore. GM Tinker has a 100% Make Chance. It takes 1 Resolves Bridle and 1 Rope. This gives you 15 more charges. Bear in mind tho, these can only be recharged twice, after that, not sure if they're just deco or disappear entirely.