On the sensibility required to make wound strings
Wound strings are a matter of hand sensibility and control of the string maker: even if a machine is involved, it is real craftsmanship to make a good wound string. The factors involved are many, from the quality and gauge of the core, how much it is dried (which affects the latter of course and also the percentage of core versus metal), and how much the metal wire is stretched from the hand of the maker (which again can result in a false string for the inconsistency of gauge of the wire but also of the core, because the hand pulling to much the wire will also pull the core and stretching it...)
In this old video Mimmo Peruffo is showing at Aquila strings factory how he makes a Cello C
For the complete video click here: