Lower belt not spinning on new clutch assembly

Initial problem was a non-spinning brusher bar. I cleaned around the bar and the ends of the bar. It still wasn't working so I identified loose belts as a possible problem so I replaced the clutch assembly and the belts.

After installing the new clutch the lower, brusher-bar side belt is still not spinning. I've double checked if the bar that engages the clutch/belt for proper positioning. I've also tried running it without anything attached to the lower side of the clutch. The motor belt still spins but the lower belt does not.

Any help would be greatly appreciated.