A connection pin comprises an elongated neck and a base at an end of the neck. The base may include a first portion, a second portion between the first portion and the neck, and a lip between the first portion and the second portion. A distance between the lip and the neck may be less than a radius of the neck. The connection pin may further comprises at least one spring-loaded element along the neck for maintaining the connection pin in a temporary fixed position relative to another element in which the neck is constructed for insertion and an actuator that retracts the at least one spring-loaded element when in a pressed position. An end of the actuator does not exceed a surface of the base when the actuator is in an unpressed position. An opening in the base may be threaded.