Mèccia (f)
(with) definite article: ? [a / la?]narrow end of a tube which fits into the mortise of the stock or of another tube
Literally: "(the) penis"; Its technical metaphor is, according to Bonanzinga, "(the) male"; The connecting points are always wrapped with cotton thread, in order to create the thickness necessary to ensure an optimal condition of the tubing.
Bonanzinga, Sergio: La zampogna a chiave in Sicilia. In: La zampogna: gli aerofoni a sacco in Italia (2005), II, p.197.