Aboard the Heart of Gold

1. Have you examined them?
2. The large receptacle is important.
3. Don't go on until you've figured out how to set up and use the spare Improbability Drive.
4. Seriously! Don't go any further unless you've figured out the spare Improbability Drive.
5. The large plug from the spare Drive can be plugged into the large receptacle.
6. But that isn't necessarily the right thing to do.
7. In fact, when you plug in the spare Drive at the wrong time, Eddie warns you that it's only for emergencies.