Krátič (m)
more or less "S"-shaped shortener, "reducing" the relative length of a drone; ➺Absolute/Relative length
Since early 19th century; The actual butt piece (lodging the reed) of the drone; Tubular, with an internal "S"-bore that "reduces" the exterior length of the drone.
NB¹: ➺ Absolute / Relative length; NB²: ➺ Bohemia.
In cross-section its 3 main bores are positioned "triangularly".