At this point, probably the most sensible thing is to let the insurance companies - yours and his - figure it out amongst themselves.
What? No insurance? Well ... all you're obligated to do is to restore things to the way they were before; that is, remove the rod, repair the rod damage, and fill the hole. What would you charge to do that job? Well, that's your contribution to the repair.
Everyone has an "oops" moment. At this point, all you can do is make a generous offer, and hope he sings your praises; new business is the sweetest 'fallout.'
