Our garbage disposal was turned on with something that shouldn't be in it in there. It all got destroyed and ground up except for this metal piece, which got wedged under the "teeth" of the disposal. I've removed the disposal from the sink and turned it upside down to crank the thing around with the hex nut on the bottom, and everything fell out except for this metal piece which is wedged in there. I've tried getting pliers in there but I just can't budge it. If I put a sturdy flathead screwdriver on it and smack it with a hammer, it moves a little but doesn't dislodge. I could probably hit it harder but I'm worried about damaging the disposal. Would it be safe to use some silicone lubricant or something else in here to help remove the piece? When I turn the thing around, the metal piece scrapes in three places around the edge.
There's usually a hole on the bottom end of these diposals which fits an allen wrench (hex key). Use that to work the the grinder back and forth until you feel it loosen. Then pull the metal out. The hex key hole is put there on the bottom so you don't have to whack around on the blades with a screwdriver, broom handle or whatever.