Our garage was vandalised yesterday. Somebody ripped out a light fixture holding two flood lights, apparently just so they could then break the bulbs in the alley. The fixture, still attached to the 3.5" round plastic utility box, was left hanging by its wiring.
The fixture was mounted to the sofit on the underside of an eave overhang of the garage.
On examination, it looks like the guy who built the garage simply cut a round hole in the aluminum siding at that point and made a cunningly bent bracket out of sheet metal which somehow held the fixture in place for 10 years.
There's nothing but empty space behind the opening and I don't think there's any access to the space from inside the garage (not for normal sized humans anyway). The bracket that used to hold the fixture in place is pretty bent up, so I'm not sure I can duplicate the magic that was used in the original installation. The siding has the structural strength of a soda can, so I can get it back into shape with no problem.
Is there any "standard" technique for mounting a box in this situation?