The cone was heated just enough that the can assembly could be twisted to the point that a screwdriver could be inserted between the base of the cone and can assembly end. Once the can is removed or pried off, the cone is wrenched back and forth to snap the snap ring at which point it will unscrew. It may be necessary to smooth out the base of the cone in a lathe if it gets a little chewed up from the wrenching.The whole point of the exercise is that the end cap can be knocked out and the can populated with appropriate materials. I also drilled holes in the cut out areas