LOCATION OF KONI CUT

Basically, you want to cut just below the metal top.
I've actually tried removing that top cap off with a cutting disc.
It won't work. I couldn't pull the strut out when I got it off.
You can use a variety of tools to make the cut.
A pipe cutter is best, but you can use a hacksaw or high speed cutter.
A pipe cutter, though, will help ensure a nice clean even cut.