"Seating" in dremel brushes?

I just got me a dremel yesterday. I was reading the manual and I found it said i need to run the dremel for 5 minutes without a loud on highest speed. Does this mean i have to remove the collet nut and the collet?

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Dremel 002.jpg
Re-design7 years ago
No. You can run it even with something in the collet. Just don't let it touch anything.