A quick release fastener is provided for a hand-operated band saw with a saw band run on wheels in a housing, which has a base tray and a hinged lid and on which there is a handle. The handle is fixed to an upper angled edge of the lid and located below the handle there is a spring-loaded handle bar with two bent ends. The one end is fixed at the edge of the lid and the other end engages in a groove in the base tray through a recess in the edge.

A self-locking support system includes a female profile having a first profile leg extending approximately orthogonally from a base, a first locking leg extending from the first profile leg, and a first tip extending from the first profile leg, wherein a gap is formed between the base and the first profile leg, and a first male profile having a fulcrum formed at an intersection of a second profile leg and a second locking leg, the second profile leg having a second tip extending therefrom. When the second locking leg is inserted into the gap, and a locking bead is positioned between the first and second tips, the first male profile is caused to rotate about the fulcrum and the first and second locking legs are caused to engage against each other.