Originally Posted by simplyconnected
That's why we always back up the location with heavier steel.
In the case of a floor pan, it's a heavy square, usually 1/4" thick with an extruded 1/2" hole (or a 1/2" Nylok nut).
In the case of a door pillar or roof rail, it's also a heavy strip of steel.
Both additions of steel are either MIG welded, projection welded or button welded in place. The idea is to spread the tension over a large area.
As I recall the factory reinforced area is oblong, no sharp edges that would tend to tear the substrate.