OMG, rivets, that ruins the whole trick! Nobody could conceivably own a rivet gun of their very own, or a drill to get the old rivets out, those tools must cost like, eleventy-million dollars. Yeah you're totally right, these trees must have grown through these chairs, how stupid of anyone to think otherwise.
Sheesh, this isn't rocket science. All you gotta do is unscrew the four screws supporting the backs of the chairs, position the chairs, and screw them in again.