How to free up fresh air vent door?

I just this weekend took apart the door hinge and latch assembly sand blasted and then hammer and dolly every thing straight and ready for paint, I an currently sourcing rivets to put everything back together but the kicker is the tool used to chinch the rivets tight, the rivets can be purchased from eBay the same type they use to restore old Tonka trucks, I will post pics on progress
did you find the right size rivets and tool? I have the same issue. Hinge is frozen. I am soaking with PB blaster and will try evaporust if PB doesn't work but I think I'm going to have to drill the rivets.