hedge trimmer ignition coil module

Small bit off topic but some DIYer mechanics may have some experience……….

There is a crack in the insulation of the wire going from ignition coil to the engine on my Maruyama hedgetrimmer.  It will start when engine covers are off but wont start with covers on, spark grounding off the metal engine via the crack in the wire. When i hold the wire in my hand and pull the hedgetrimmer over i can feel the electric pulse in my hand.

 I removed the ignition coil and the wire has a heatshield on it, crack is under the heatshield. The wire doesn't seem to  be removable from the ignition coil itself, seems to be glued in or moulded in even, and the end which attaches to the sparkplug is moulded onto the wire.

 Do I have to get a new igniton coil or is there a trick of the trade for removing it from the coil so I can replace it. I havent tried pulling it yet.