As others have suggested a rare earth magnet from an old hard drive
would be a good start. You can buy the magnets in all shapes and sizes
on eBay - you'll find a million uses for them so do NOT worry about
getting too many. They're great for hanging full size calenders on
I don't think you'll have too much of a problem with the light. The
LED would work, but you could probably do without it. I'm assuming
that the orientation of the pliers for extraction through the small
aperture is your concern, and not locating the pliers. Locating the
pliers should be easy with a magner, barring other movable iron-based
objects of the same weight that aren't attached inside the hole.
Having two of the magnets on separate wires should take care of the
orientation. Pull up the pliers as far as you can, then insert the
other wire as far to the side as the opening allows and then pull off
the first magnet. Repeat as necessary. That will walk the magnetic
attachment point to one end of the pliers so you can lift them through
the hole. If you can't pull it out, you may have grabbed the wrong
end, so just walk it back to the other end.
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