not to sound like a fanboi, but lumping ALL 1911s together is a bit unfair since they come in varying calibers, manufacturers and even quality levels.
Its like lumping all AK's or ARs together.
hell, I can get a Coonan in .357 Magnum fer cryin out loud...
I just grabbed that video as it is accurate and displays the basic premise.
I had massive one and stuck it (on a double toggle ) inside of my computer case, between the drives when I was in the Middle east.
just in case...
electromagnet
Get a Framing screw or bolt, wrap wire around it (ALLOT) Connect to Lantern Battery
The Lower being non ferrous aluminum, will not attract, the pin being (at least a low grade) steel, will.
https://www.youtube.com/watch?v=iSuSWi7YThA
very well articulated
I would recommend finger paint to aid in determining the area to be removed with the WCs. Try it out on an old or cheap set first.
I actually prefer this setup for the exact reasons 1006 stated.