Abstract: A removable pin for securing two or more structures together, the pin including an insertion aperture for aiding in assembling the pin into at least one of said two or more structures. The insertion aperture is formed to receive and allow the passage of mechanical components that are necessary for proper functioning of the pin or overall mechanical device associated with the pin. A tool sized for insertion into the insertion aperture may be utilized to insert the mechanical components through the insertion aperture. The tool may also be utilized to manipulate the pin such that further assembly is possible.