Kirby. Seems like you know alot about the Kirby. I know how to use my Sentria (unlike these other

Question

Seems like you know alot about the Kirby. I know how to use my Sentria (unlike these other idiots) but I keep s******g up the shampoo tray assembly. The brush snaps into the tray just fine but the tray doesn't really stick to the head. It detaches when pushing and pulling the unit. And who knows where that cover goes? It say 'push here to open'