For you DIYers that work on your own vehicle, there's nothing like replacing your spark plugs only to find out that the boot on the end of the wire has stuck to the spark plug and has detached itself from the wire/coil pack way down inside the spark plug tube. There is a commercial tool that costs around $30 but who carries that tool locally?
Remove the inner core end plug from the blunt end of the cut stake and discard the plug.
Using a lighter, heat up the plastic until it starts to soften and peel back.
Careful...the steel core will be hot!
Use the box knife to remove it from the steel core.
Split the end of the tool just a little to allow the tool to expand over the spark plug. I used needle nosed pliers inserted and rotated it to widen the end a little. The weld cracked on the end and a quick test fit over a used spark plug confirmed it was a good tight fit.