Is your problem that the wires are too short, or something else is in the way, that prevents the toggle from dropping down?
I'm assuming that you unscrewed the ring/nut on the top, but it still wouldn't move. This is a somewhat separate problem, not likely to be addressed by the FAQ, so I thought it was worth asking.
As long as the wires look long enough and you don't believe you'll damage anything else, I would suggest pulling - or twisting a little - on the body of the toggle from inside the cavity. Perhaps the wood has swollen a bit, but aside from the nut on the top, there should be nothing holding the toggle in place.
Assuming you get that far, the pinching technique is pretty simple, but the key is to come up with a good tool, preferably so you can squeeze the pins together, rather than try to tap them in from each side. If you don't yet have any great ideas on that, email me.
(Sadly, I pinched mine, heard the pins click in place, and while it helped a little, I still needed a new toggle. But from what I understand, most of them can be fixed.)
