Audio Precision System One - How to Change / Insert Primary Line Voltage Card?

I need help! I've recently acquired Audio Precision System One and trying set the primary line voltage to 240V.

Silly me pulling out the voltage card too hard, it flew out so fast and I didn't manage to see the original orientation. So for 240V does anyone know whether to insert in A or B direction into Audio Precision (refer photo below) . Thanks in advance! :

Screenshot 2023-08-15 at 11.47.11 PM.png

I tried reading the AP manual but the diagram looks nothing like my voltage selector card :
Screenshot 2023-08-15 at 11.49.02 PM.png