The SSD area on the motherboard may also be used to install other devices, or accommodate physically larger SSDs, or even to hard-solder an SSD salvaged from a 2GB or 4GB 700 model.
From the en.wikipedia.org
It's not that hard as long as you can solder well, and can locate the right stuff.
From the techcrunch.com
By using the hard, high-melting point solder first, followed by solders with progressively lower melting points, goldsmiths can assemble complex items with several separate soldered joints.
From the en.wikipedia.org
Dual illumination systems optimize lighting for hard-to-detect defects in metal plating as well as in solder mask layer.
From the foxbusiness.com
Gold solder is used for joining the components of gold jewelry by high-temperature hard soldering or brazing.