[2] is remarkably interesting:

- "And that mechanism doesn’t just wear out after nearly three-quarters of a century of use: there’s a single screw underneath the crumb tray to adjust the tension of the wire, and it alone is enough to bring many aging toasters back to life."

edit: There's other HN threads about it,

https://news.ycombinator.com/item?id=29342936 (232 comments)

https://news.ycombinator.com/item?id=38868753 (76 comments)