Whenever a motor quits working, first I always change the brushes out, which does not always work. WARNING: You should not wait for the motor to quit working before changing the brushes. That is what ruins the motor prematurely, which it what I do.
I took the old bush out and I am holding a new brush. Note the tab with the arrow.
I first push the brush against the cylinder in the middle at an angle. You push the brush in until the tab on the brush side lines up with the hole on the vacuum motor. Then twist the brush into the hole.
Now hook up the wire to the brush and screw it back down to the vacuum frame. Done.
After changing out the brushes the motor started sparking and blew the power breaker. So I guess this motor is garbage. Which is its new home.