Casquillo

/ kahs-KEE-yoh /
ConstructionSpanish
Definition
The small round or oval piece of wrapper cut to finish the cap, punched from wrapper offcuts with the chaveta and fixed over the head with a touch of gum.
Why it matters
The casquillo seals the head and establishes a clean cut line; one that is poorly seated will unravel the moment the cigar is cut.
In context
"Cut just above the casquillo and the cap holds."