Wait, what? Mac Pro's $400 wheels don't have a lock.

When Apple announced that the wheels for its pro-grade, $6,000 Mac Pro desktop machine are purchased separately for $400, we thought they must be special. And they are.
That's because, unlike most wheels on furniture that cost half that of Mac Pro's wheels, the Mac Pro wheels don't have a lock. 
This was pointed out by tech reviewer Marques Brownlee, near the end of his Mac Pro review on YouTube (the bit with the wheels is around the 11:00 mark in the video). So, if you plan to keep th