Parker grins, points to the tool that's bent at a right angle "so that one's for tensioning, you insert it into the lock and press a little, the same way you would turn the key. Now this one-"

She's going pretty quickly through her explanation, but it's thorough and leaves just enough room for Darcy to ask questions as needed, once she's finished she smiles again, encouraging, as she asks "would you like a demonstration first, or do you want to just give it a go?"