Phillip, at Bike Tinker, replaced the frame on an old B.72. He writes about his experience and posts a few pictures here. The chromed-steel rivets are not from Brooks and I asked him about them:

I got them at the hardware store (True Value), which is inside a farm store (Wilco). I had the old saddle, so I could gauge the length I needed, and I got some good advice from a young guy there who seemed like he’d riveted a time or two. “The copper ones just go over like butter.” He also recommended splitting the rivet with a chisel to make it easier to peen the parts over.

Tags: frame, repair, rivet