[mcrdev]

IIRC there were two events that were fixed in the original show - The Wall and you could sometimes see the rings from Hang Tough floating around in the background of the shot, which suggests some sort of rig you can just raise/lower as required.

If you looked in the background of the shots during The Wall on this week's episode, you could see The Edge half set up in the background, which while it does live in the roof, needs a fair bit of set up to be played.