The middle spray arm would not spin

I removed the upper spray arm using a nut driver and noticed that the upper spray arm mound was broken causing the spray arm to hit the side of the tray. It was easy to snap the old one off. I ordered a new spray arm kit and the upper arm mount. They came the next day and I installed it in 5 minutes. I put the mount on first (it clicked into place) and the rear support bracket. I screwed the new spray arm on to the bracket from the bottom.