Abstract: An adjustment construction for adjusting the active sheath length on a Bowden pull wire for mounting in an opening of a support wall. The arrangement includes a Bowden wire moveable in the sheath and a sheath end piece having an end into which the sheath is engageable, the sheath end piece having a surface defining a plurality of stops. The stops are positioned to provide gaps between adjacent stops and the sheath end piece is provided with a toothed rack-like displacement ribs on the outer surface of the plurality of stops. The periphery of the sheath end piece defines a longitudinal groove extending through the stops and interrupting the stops. A socket is provided for support of the Bowden wire. The socket is mounted in the wall opening and has a passage before the sheath end piece and the wire and includes an end engaged over the sheath end piece with a frictionally engageable end face. A support sleeve is provided having an interior bore engageable around the sheath end piece.