Found this really great video of the Brompton factory, from the perspective of a Youtubing blacksmith. Loads of cool insights into their mass production processes (including $12,000 torque wrenches that have the torque specs RFID-coded into the sockets), and also a few minutes on the intricacies of brazing. If you think you can do nice smooth fillets, think again.
He also has a 6-part series on making a steel MTB frame, though I haven’t watched this yet. Plus loads of cool stuff about making axes, restoring steam hammers and general metalworking shenanigans.
