The present invention relates to a lock (3) for a device (1) for temporarily spacing an opening element with respect to a fixed element of a motor vehicle body, said lock comprising, on the one hand, locking means (21, 23) designed so that they can deform elastically under the action of the stresses exerted by the opening element and, on the other hand, a substantially cylindrical pedestal (14) provided with fastening means (16, 17, 27) which can be activated by pivoting the pedestal about its axis. The present invention also relates to a base (2) intended to cooperate with a lock according to the invention.