Brass it is. I see where the aviation and old tractor industry repairs their own brakes/clutches. I got a hand held or bench vise tool they use that's supposed to grind off the rivet, punch it out, countersink the lining, and press a new rivet in. I did see some old hand lever bench top rivet tools on Ebay but the dies appear to be missing. We'll see what happens when I get it all.
