A little mechanical excitement

[Rocky_imp]

If we lived in the post apocalyptic world of Mad Max, with no reasonable alternative, I would suggest thorough cleaning, duct tape the hole outer surface, pour liquid steel or some such into the cavity, Let dry, remove tape, cross fingers, and go another gazillion km.

Ben

I thought of something like that too, but would be concerned that vibration, heat expansion and contraction might eventually break it free.
Since the cover is out of sight I like the welding option better as suggested by Razor.
All that said, I suppose if it was me I would buy a new cover