An accessory attachment apparatus, comprising: a ring feature fixedly attached to or integrally formed upon an accessory and having central axis, the ring feature having defined thereon a first mounting surface and a tapered surface sloping toward the central axis and away from the mounting surface; an annular member fixedly attached to a second mounting surface, formed on a device to which the accessory is to be attached, the annular member having an inner surface dimensioned to concentrically face at least a portion of the tapered surface when the accessory is attached, the annular member having a plurality of spaced apart radial through holes extending through the annular member from an outer surface to the inner surface; a corresponding plurality of spring-biased pins (46A-C) disposed in the plurality of radial through holes, each spring-biased pin comprising a head, a conical tip for engaging the tapered surface, and a spring (47A-C) biasing the pin to resist the engagement with the tapered surface; and a rotation plate disposed about the annular member, the rotation plate including an inner surface configured to oppose the outer surface of the annular member when the accessory is attached to the device, the inner surface having a plurality of ramps circumferentially formed therein and configured to receive at least one of the heads of the plurality of spring-biased pins (46A-C); and wherein the rotation plate is rotatable from an unattached position wherein the ramped surfaces apply no radial inward force to the spring-biased pins (46A-C), to an attached position wherein each ramped surface longitudinally displaces one of the spring-biased pins (46A-C) inward through its corresponding through hole such that the conical tip of the spring-biased pin engages the tapered surface of the ring feature, thereby immobilizing the accessory with respect to the device. a ring feature fixedly attached to or integrally formed upon an accessory and having central axis, the ring feature having defined thereon a first mounting surface and a tapered surface sloping toward the central axis and away from the mounting surface; an annular member fixedly attached to a second mounting surface, formed on a device to which the accessory is to be attached, the annular member having an inner surface dimensioned to concentrically face at least a portion of the tapered surface when the accessory is attached, the annular member having a plurality of spaced apart radial through holes extending through the annular member from an outer surface to the inner surface; a corresponding plurality of spring-biased pins (46A-C) disposed in the plurality of radial through holes, each spring-biased pin comprising a head, a conical tip for engaging the tapered surface, and a spring (47A-C) biasing the pin to resist the engagement with the tapered surface; and a rotation plate disposed about the annular member, the rotation plate including an inner surface configured to oppose the outer surface of the annular member when the accessory is attached to the device, the inner surface having a plurality of ramps circumferentially formed therein and configured to receive at least one of the heads of the plurality of spring-biased pins (46A-C); and wherein the rotation plate is rotatable from an unattached position wherein the ramped surfaces apply no radial inward force to the spring-biased pins (46A-C), to an attached position wherein each ramped surface longitudinally displaces one of the spring-biased pins (46A-C) inward through its corresponding through hole such that the conical tip of the spring-biased pin engages the tapered surface of the ring feature, thereby immobilizing the accessory with respect to the device.