Consider the technical drawing Dr Vaughan gave you
From Fallen London Wiki (Staging)
| Spoiler warning! This page contains details about Fallen London Actions. |
From: Ambition: Light Fingers – Preparing an Expedition to the Roof
Action Cost: 0
Dr Vaughan left you clear, but esoteric instructions on how to construct a device to ensnare the Moon-Mother. But what do you need to do?
Locked with 
Success
Building to specifications
It follows an inverted logic. Or a logic turned inside out, perhaps. But it should work, if you follow her instructions to the letter. You could build the thing in your Lodgings.
