A harvester has an attachment, for rotatably supporting the support arm of the support wheel to the frame of the header, that includes a first bearing device with a substantially horizontal axis for rotatably supporting the support arm of the support wheel to the attachment, so that the support arm is tiltable between an operating position and a stowed position. A loudspeaker device in which unnecessary vibrations are removed and also the quality of acoustic signals is excellent up to high range is provided. The restraints may be incrementally adjustable to stabilize two or more portions of a person’s body, such as the back andor pelvic regions, against the support structures in any number of three-dimensional orientations that produce a substantially pain-free position.