described above as a mere example of a connection system of the present invention is easily generalized by those of ordinary skill in the art to a wide variety of mechanical connection applications including but not limited to those identified above the present invention further provides a connection system for connecting parts of an apparatus a first part having one or more pin receptacles cooperatively mates to a second part having one or more spring biased pin assemblies the second part further provides one or more pin assembly housings the first and second parts assemble such that at least one pin assembly housing aligns with at least one pin receptacle at least one pin assembly disposed through the at least one pin assembly housing selectively engages the pin receptacle to secure the connection of the first part to the second part of the apparatus each pin assembly may include a pin assembly sleeve having a spring stop a spring seated within the sleeve a pin also having a spring stop rotatably disposed through the spring and a removable pin handle connected to the pin distally from the pin spring stop the pin selectively engages the retention pin receptacle with a spring loaded bias to secure the connection of the first part to the second part of the apparatus an alternative embodiment of the pin assembly provides a spring biased pin assembly with a pin assembly sleeve having a distal spring stop and also having at least one slot to receive a pin.