Top Corner Latch re-bolting

Just bought a 2008 TM 3326 and although I really had some terrific instruction from the previous owner, I still managed to shear off the Top Corner Latch bolt the first time I closed on my own when I overlooked a Velcro seal flap that prevented the trailer from closing easily. I now know that “Easy does it!” is the rule.

I am not making any progress in fixing the sheared bolt which holds the shiny metal bar that comes up to catch a pin in the front top. The old, broken bolt resists being “grabbed” or drilled out because it seems to go into a small metal structural piece that is filled with some soft substance. I don’t know how this could have kept the original bolt from pulling out, but somehow it did.
Has anyone made this repair or something similar, and how?