How do i proceed in the start of the second tower area?

I reached the second tower after opening one lock on throne room, went down the curtains etc. theres raised platform in front with a ladder and a large spinning wheel in front of the platform.Where do i go from here?? the walkthroughs say descend the ladder but ladder is not through the small hole in the platform. i jumped to the left and navigate up the upper platform where the ladder starts. here i try jumping across the giant wheel, after slowing time but keep getting killed? Did i miss a lever or switch,how can i get past this?