How do you repair the ski lift motor in My Sims Agents?

There are three gear belts to work with: one is long, the other is medium, the other is short.

The short gear belt connects a small gear (it is linked to the second large gear down, on the far left) and another small gear (which is the far left gear in the pyramid-like set of four small gears in the center of the screen).

The medium belt connects a small gear (at the top-center of the pyramid-like set) and another small gear (the second gear down in the stack directly below).

The long belt connects a small gear (it meshes with the large gear nearest the center and another small gear to its left) and the second small gear down from the large gear shown in red.

If this is too confusing, just go to this video:

YouTube.com/watch?v=hOVSBWvYLrQ">http://www.YouTube.com/watch?v=hOVSBWvYLrQ

This is one of the better walkthroughs I've seen. The finished repair map is at 11:48.