6. Welt Test. Three burning cigarettes shall be placed in the depression created by the upholstered furniture and the welt parallel to the welt. If there is no depression at the welt, hold the cigarettes in place along the edge and parallel to the edge with straight pins. Three straight pins may be inserted through the edge at a 45° angle such that one pin supports the cigarette at the top, one at the center, and one at the butt. The heads of the pins must be below the upper surface of the cigarette