Jury Rigging

 is a perk in Fallout: New Vegas.

Effects
"You possess the amazing ability to repair any item using a roughly similar item. Fix a trail carbine with a hunting rifle, a plasma defender with a laser pistol, or even power armor with metal armor. How does it work? Nobody knows…except you."

The perk basically allows you to repair items based on category, instead of type. For example, you can repair the rare Ranger Sequoia with the common .357 magnum revolver. Same goes for armor and clothing as well. Essentially, this perk is very useful by allowing you to use more common items to repair other, more uncommon items.