Decided to do this because i noticed under the AA special tab, Time: form of Rejuvenation 0/6, this item when clicked will indeed give you 6/6.
I did it with 2 level 110 rogues, (and other in the group to get the task).
The main thing to focus on is getting a chr up the room elevator before the 4th spawn of breakneck, because after that the elevator breaks and your screwed.
I sent one rogue straight to the room, and since you gotta open doors, i got breakneck to spawn 2 times on the way there, being 110 it wasnt hard, he just blinds you. There will be other mobs that will spawn on top of anyone else who zoned in, easy mobs that didnt really even hurt at 110. I did not need a healer at all, and of course you cant use mercs being a raid.
I got one rogue to the elevator room and went up, takes a few clicks, as long as it says it isnt broken and you didnt spawn breakneck 4 times you will get to the room.
I parked that rogue in the breakneck final room, and went around with the other chr clicking doors to get the final few breaknecks to spawn.
It was a quick fight, and i got the belt on my first try. Once again, the only main thing to focus on is getting a chr to the breakneck room before the 4th breakneck spawns.
Hope this helps! Happy hunting.