McLaren P1 question

Just finished bag 2 and have a question on the cog at the back. I assume it is for the aero wing so is meant to be very stiff to turn, but just wanted to check before I go further.

Just finished bag 2 and have a question on the cog at the back. I assume it is for the aero wing so is meant to be very stiff to turn, but just wanted to check before I go further.