RE-insert brush bar? You mean insert new brush bar? (Not reinsert the old one like in the picture because after all this is instructions for replacing the brush bar right?) Aakkk!
At the bottom it says "to reassemble follow these instructions backwards"...something like that.
Excuse me I have to scream now.
I just run the water hose through mine then let it dry completely before putting it back together and especially before using.
It's all plastic so it can't hurt anything.