points one d on the arcuate surface and more than one e f at points on the cone cam substantially equidistant from the first in this arrangement it is noted that the vertex angle of the cone cam would ideally be reduced from 45 u00b0 and that this would require an associated change in the curvature of the arcuate surface to achieve the required cam angle a cone cam may be employed by itself to provide an anchor at various sizes of openings in a surface alternatively there are a number of additions which may be employed individually or in combination to improve the range stability or ease of use of the device such additions include but may not be restricted to the following attachment means to connect the device to a load a wide dual or otherwise shaped arcuate surface profile a blunted multi point or otherwise shaped vertex additional fixed or moveable members attached to or near to the vertex additional fixed or moveable members attached to or near to the arcuate surface actuator means to rotate the cone cam from a narrower orientation whereby it easily may be inserted into or removed from the surface opening to a wider orientation wherein it may be securely wedged within the surface opening such means including spring means actuator means.