Skobel (m)
plural: Skobleeach of the more or less "U"-shaped tubes, connecting the pieces of a shortener
Each of the 2 "U"-shaped tubes connecting the wooden pieces of the "shortener".
Made of metal.
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.93 (skoblami [plural, instrumental case]).