The feet are held in place with just one screw each—although the screws themselves are buried deep in slots in the space frame pillars, making them a bit awkward to access. We make do with a 4 mm hex key and a Mako driver for extra leverage.

The screws are held captive inside the frame, so you won't lose those, but we can't say the same for these feet. Better keep an eye on these things so they don't run away.

We didn't shell out the $400 for the wheel-y upgrade, so it's nice to know that we don't really need to drag this thing to the Apple store to swap its shoes.

If you're feeling adventurous and want to attach your own feet or wheels, the screws are M5x0.8. Since we can't remove them, we're unsure of their exact length, but we estimate 15-20 mm. They extend out about 4-4.5 mm from the bottom of the aluminum slab.