I had heard about a home formulated oil that was said to be good on frozen screws in rifle barrels. I had a electrical terminal tie point on my old car that I wanted to get apart. It was a threaded stud on a copper bus with a nut that wouldn't budge. The bus was heavy sheet metal that would've crumpled up with any hard force. I ordered 3 glass nail polish bottles from American Science and Surplus to put it in. It was Ford automatic transmission fluid mixed with oil of peppermint from Walgreens. 1/3 peppermint oil to 2/3 ATF. I brushed some on the tie point and waited an hour. I was then able to get the nut off without damage to the bus. I have since used it on clock assemblies and other difficult nuts, bolts and screws. It smells good too.