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 . <EOS>