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Volumes

1. Vol 1 Making the Parts That No Longer Exist — Vol 1: What You Can Honestly Make Teletype Corporation stopped making these parts decades ago. Some of them you can genuinely fabricate on a hobby bench; some of them a 3D printer will destroy your machine trying to replace. The skill is knowing which is which before you cut.
2. Vol 2 Making the Parts That No Longer Exist — Vol 2: When Newer Is Genuinely Better Some replacements are compromises. The loop supply is not one of them: a modern interface drives a 1930s selector magnet better than the 100-volt resistor bank ever did, and it does it from a wall wart, cold.