Alessandro Manzoni tra l'ancudine e l'incudine

In Fermo e Lucia the phrase tra l'incudine e il martello appears. After having eliminated it in the "seconda minuta", in the Ventisettana Alessandro Manzoni reinserts (essere) tra l'ancudine e il martello, and this idiomatic expression remains in the Quarantana. The paper highlights particular aspects in order to explain the reasons that may have led Manzoni to prefer ancudine to incudine, before and after his journey to Tuscany.