Kolanko (n)
stock for the bellows
A joint piece, cut from a single branch with the required natural bend of approximately 90°; NB: ➺ homonym (drone stock of a Dudy żywieckie).
Sobiescy, Jadwiga [Pietruszyńska] & Marian: Polska muzyka ludowa i jej problemy [Polish folk music and its problems]. Wybór prac pod redakcją Ludwika Bielawskiego [A selection of their works edited by Ludwik Bielawski]. Warszawa, 1973, p.116.