Hi, Folks.
Here are a couple of links to videos about the Lock-n-Stitch method of cast iron crack repair - might be helpful to somebody.

https://www.youtube.com/watch?v=Pq0wfU4ZaKk

https://www.youtube.com/watch?v=FIKY--USk7Y

And a couple of videos about welding cast iron with Muggy electrodes:

https://www.youtube.com/watch?v=kzbcVb2UymA

https://www.youtube.com/watch?v=K85MH9Z5FPU

Just my 0.02