contact member revmeup, he has a good fix for this problem
If you don't fill that hole, so that it is a perfect hole it will just come out again. And more work again. This happend to me before I just did what offshore24 recommend with welding it closed. Next time use more and then more loctite on.weld the hole closed, grind it flat and smooth, drill it out again. Or weld a plate over the hole on the outside and drill a new hole in it. You'd need a little longer bolt.
Try this threadMember "revmeup" sells stainless steel reinforcing washers for this problem. Anyone have any insight on this? Pictures? How exactly do they work?