Big yellow thing #2

In my yesterdays Blip was a big yellow thing.
Today the rotor of the alternator is safely in his cocoon.

The maintenance department has told me it's was no problem for the rotor to be without protection for a day.
The manhole is open but tomorrow it will be closed and the cocoon will be filled with nitrogen (the green bottles).
My shoe is in front of the thing so you can see it's quite large; the thing, not the shoe, that's size 46 (= US 12).

Here in LARGE....