Tappelstuck (n)
(with) definite article: TappelstucketRusswurm’s odd remark (»In die Flöte wird ein Birkenreis v. c. 4 Zoll [= 105,4 mm] Länge gesteckt (tappelstucken)«; ➺ Rehnberg, p.23), is rather confusing, because it suggests the Tappelstuck to be a reed, the size of which seems to be more appropriate for a drone-pipe, instead.
Rehnberg, Mats: Säckpipan i Sverige ([The bagpipe in Sweden]). Stockholm, 1943, p.23 (»Russwurm).
Allmo, Per-Ulf: Säckpipan i norden: från änglars musik till djävulens blåsbälg (Bagpipes in the nordic countries [From music of the angels to the devil’s bellows]). Stockholm, 1990, p.429 (➺ Musikmuseum 8604).