The Apple Mac Pro is the most opulent desktop computer ever made. So much so that the company charges $400 for a set of wheels to add a certain degree of portability.

Despite requiring $100 a wheel for the privilege, they’re missing one very obvious feature, the ability to prevent unwanted movement by locking them in place. Yes, if you’re placing your Mac Pro on your desk, you’d best ensure there’s no slope, because your expensive purchase might end up on the floor in a number of very expensive pieces.
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