Brushes will not spin -- broken part. I have a Hoover F7222-900 Steam Vac Upright vacuum cleaner.

Question

I have a Hoover F7222-900 Steam Vac Upright vacuum cleaner. The brushes have stopped working. When I pulled the brushes out of the assembly, I noticed that the plastic square peg cracked in half. The other half is stuck in the hole. I can't seem to dis-assemble the vacuum to get the plastic piece out. I pushed it and it went further in the hole.

I realize that I have to replace the brushes because the plastic piece which gets inserted into the hole is broken. Does anyone know how to dis-assemble the vacuum. We've unscrewed all the screws, but it doesn't seem to want to come apart. I'd hate to sent it to the shop when it's just an easy fix.