When a laser beam is irradiated onto a semiconductor film, a steep temperature gradient is produced between a substrate and the semiconductor film. A threshold value that is relevant to the triggering of an anti-pinch protection system of the window lift is regularly adapted to the actuation-position-dependent behavior of a sensed operating quantity of the window lift, at least in a lower region of the actuation path of the window, both when the top of the convertible is closed and when it is open. After initial placement, a fastener applier system is introduced within the expanded prostheses to deploy a plurality of fasteners to at least one prosthesis end. Connections occur via partial areas with varying flexural strengths and both partial areas are offset at an angle of 90.