Step 1: What You'll Need
Solder (Lead-free solder is harder to work with but less toxic. Choose wisely.)
Würth Elektronik 693 063 020 911
Valcon 412D02F-09PC003-SV SD Card Slot (OEM Part)
A Well Ventilated Area or a Fume Extractor
What appears to be a direct replacement for the SD card slot (Valcon 412D02F-09PC003-SV SD Card Slot) is available from Toby Electronics in the UK, but shipping to my place in Detroit is almost more than the cost of two new Raspberry Pi model B's. Currently Digikey stocks a suitable replacement (Würth Elektronik 693 063 020 911) that's much more economical for those of us in the USA.