N62 / 4.8i 4 zone AC Belt Pulley hack (while keeping everything stock)
 

Really difficult to loosen up because there's additional lines in the way of the torx (m40) bolt to adjust with from the bottom. I looked at two videos, one guy struggled with it, the other notched the bolt from the top to adjust it.

I took a simpler approach. The bolt is M8x1.5 threaded. I picked up two nuts from ACE, and threaded both onto the bolt and locked them up. I then just used a ratchet and socket from the top to drive it down loosening the belt, and a box wrench to walk it back up to tighten it.

Doing this you don't need to remove the under tray, and you don't need to cut your hands up on a weird hit for the socket. You hold the bottom nut with the box wrench, and loosen the top one and remove both when finished. Everything remains undamaged and serviced.

https://i.ibb.co/3h5kW4r/61-Jw-Xcxow-HL-AC-SL1000.jpg