In a tin shed in the backstreets of Kinshasa, Democratic Republic of Congo's capital, a barefoot 61-year old Jean-Luther Misoko Nzalayala, aka Socklo, hacks with a machete at a lump of wood that is starting to resemble the neck of a guitar.
Later, he hammers bits of white plastic chair into it as inlay to help guide players around the fret board, and fixes threads of motorbike brake cable as strings.