Emerald City Blue
Armorer's Tool Kit
Building and repairing items require the right tools for the job. Tools must be bought separately for a specific skill (for example, an Armorer shop, a Disguise kit, a Nautical Mechanic facility, etc.) A kit is portable and contains the basic gear to make standard repairs.
There are some guidelines to help you figure out when a kit, shop, or facility is necessary for a particular job (Building & Repairing. p.145). The gamemaster gets final say, though, and might even tell you the you need specific or unusual parts you have to get separately.