How does this heater box retainer rod (J-hook) work?

Dartswinger70 said
Yeah I just ficked one up from a FABO member. My heater box had the area with the J hook hole missing, I repaired it with fiberglass resin and mesh, I am wondering if the j hook is going to break through my reapair at this point, I am not sure but that area looks "reinforced" from the factory. Obviously didnt last forever though beecause alot of heater boxes are blown out in that J hook hole area.

I repaired the inside and outside of my heater box with JB Weld. That has held up great. I believe I used a large washer to distribute the pressure from the J hook on the bottom. I also used a couple of washers to reinforce where the heater box attaches to that part of the box.