Leer Topper Door

Not sure if this is the right forum, but after buying and installing new handles and new struts for the lift-up door on my topper this summer, the piano hinge is now coming apart on one side. The dealer is going to try to rivet it before ordering a new one. It's quite possible they'll break the glass but it's worth a try before sinking several hundred dollars into a new door.

I'm wondering if replacing the hinge is possible. The dealer says no, but there should be some alternative to replacing the entire assembly for a relatively cheap part. Any ideas or suggestions will be appreciated.