Awesome article by John L Marshall. I just found this recently courtesy of Dave a buddy of mine. When John Moses Browning designed the 1911 pistol, he also ensured that you do not need any additional tools to disassemble or reassemble the gun. Here are some of the parts that are used as tools for the 1911.
Read the whole article here : http://www.sightm1911.com/lib/tech/toolbox.htm