Henry, I remember sweating blind tapping the #3-48 bolts on the bearing caps for the drums and parts on the walking cams. #0-80 is a whole new world that I've learned on the structure.
Tom, I need rivets because the heads of the bolts will hit on the two axises of the angle. I'll rivet these and solder. I don't think just solder will hold well here and rivets look so nice. It will be clearer when I get it installed.