Forget the JB Weld, it is a waste of time.
I am not pointing fingers, but, the cast iron broke, the JB is 10% of the strength (or less) of the CI. It will fall right off. The epoxy needs a LARGE surface area to be successful.
Nickel weld or braze is the best, some people have luck with MIG (not me).
Drill deeper, if you have material, is a good option.
