Abstract: A part for a ski binding comprising a carriage slidably attached to a base plate. One end of the base plate is fastened to the ski with fasteners, while its other end rests freely on the bottom of a U-shaped clamp, also fastened to the ski with fasteners. Attachment of the carriage to the base plate is accomplished by carriage structural features that retain the carriage in the clamp, and further carriage structural features that prevent the carriage from being vertically disengaged from the part of the base plate adjacent to the base plate's fastened end. However, such features allow the carriage to be moved horizontally back and forth relative to the base plate along the longitudinal axis of the ski. The ski binding part disclosed prevents a substantial amount of the vertical forces ordinarily experienced during skiing from being transmitted to the ski through the base plate, allowing the base plate to be made of lightweight construction.