How to kill a maple stump?

/ How to kill a maple stump? #21  
I killed a sweetgum stump by drilling many 1" holes and pouring magnesium sulfate (Epsoms Salt) in them. Tree never sprouted.
 
/ How to kill a maple stump? #22  
Many years ago when I bought my place I had very little money, but tried this and it worked. A fellow gave me a large spool that wire comes on. Wood had rotted and left the very large galvanized metal center.
I drilled holes in large stumps, poured used motor oil in them. I put spool over stump with a few bricks on bottom for airflow. Then some wood on stump and lit it.
It burned for a week, finally you could see roots burning underground.
 

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