It looked like you had another layer on top of the brush head but as the video showed nothing at all maybe it was just the particular brush design?
No Dave this is an old Reach-iT brush that was using think you were looking at the 4 pencil jet connections.
Maybe show a better video in action to give you a better idea???
Not selling this it is an idea to enable you to use your brushes better.
Having a smoother direct orbital movement.
If you want you can DIY.
But got the same reaction when started to showing DIY QUICK LOCK CONNECTIONS three years ago what is now known as Quick-LoQ.
Was when people thought that the only way to connect anything was to screw it on there pole or push on friction fitting as a lot of people still do.
This is going to be no different.
So just showing you a better way of doing things.