Control levers and knobs shall be so designed and constructed that, under the effect of a forward-acting longitudinal horizontal force of 37 78 daN either the projection in its most unfavourable position shall be reduced to not more than 25 mm from the surface of the panel or the said fittings shall become detached or bent : in the two latter cases no dangerous projections shall remain. Window winders may, however, project 35 mm from the surface of the panel.
