No Ignition Spark on McCulloch Super Mac 26?

I have a McCulloch Super Mac 26 that is around 20 years old. I am not getting any ignition spark from the Spark Plug.

I have

1) Changed the spark plug
2) Checked the electrical connectivity between igntion coil and spark plug
3) Cleaned the connections between the igntion coil and 'flywheel' with the magnet.
4) I have reset the distance between the ignition coil and magnet as best I can but I am not 100% sure it is correct.

The only thing left is the ignition coil is broken. The old part number is 219782. So far I haven't been able to source one. If anyone knows where I can get one or has any other ideas any help would be appreciated.