Again, it's futile whatever you skills are because you have an insulative air gap, ever so small it may be between the two plates. It cannot cut through it, no matter the heat you put into it. Once you cut through the top, you have to essentially preheat the bottom plate all over again. It is nearly impossible to do because of the way the oxyacetylene burns the carbon out of the metal. Once thermal continuity is lost, it won't cut. That's why you can use a torch to "wash" a nut off an axle stud, or a stuck or gaulded bearing off a shaft and NEVER touch the piece underneath. Not so easily done with plasma because the arc is 10k degrees and if electrical continuity is there, its going to cut.