To remove the brush (also called the beater bar or rotary brush) from a Black and Decker vacuum, you'll generally need to follow these steps:
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Pull away any visible debris: Before attempting to remove the brush, clear away any large clumps of hair, string, or other debris that might be wrapped around it. This will make the removal process easier.
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Disassemble the unit: The video states that after you have made sure all debris has been removed from the beater bar, you can reassemble the rotary brush unit and reattach it to the floor head. This indicates that, at least for the model shown in the video, the brush removal is part of a larger process where the whole rotary brush unit is reassembled. Therefore, consult your vacuum model's manual for how to disassemble the brush unit from the floor head.