Patent ID: 8454260

Claim:
A pop-pin, comprising: a shaft comprising an exterior surface; a first end; a second end; and a first cylinder having a first diameter; a second cylinder having a second diameter smaller than the first diameter of the first cylinder and comprising the second end and a third end; wherein the first cylinder comprises the first end and a fourth end; and wherein the third end of the second cylinder is attached to the fourth end of the first cylinder; and wherein the fourth end of the first cylinder comprises internal screw threads, and wherein the third end of the second cylinder comprises external screw threads and the first cylinder and the second cylinder are configured for threaded engagement; a trigger catch extending perpendicularly to the exterior surface of the shaft; a retention catch extending perpendicularly to the exterior surface of the shaft and disposed between the trigger catch and the first end of the shaft; a handle disposed on the second end of the shaft; and a coil compression spring disposed around the shaft and dimensioned for capture between the handle and the retention catch; wherein the trigger catch extends sufficiently from the exterior surface of the shaft to maintain the spring in an unstable equilibrium position when the coil compression spring is biased against the handle, and wherein the retention catch extends sufficiently from the exterior surface of the shaft to retain the coil compression spring between the handle and the retention catch.