Guessing that No1 is suspected to be trapped under No2..? If so then one has to ask why No2 extends as it does beyond the heater box, and if No 1 has a flange bent back and trapped under No2 why might it need No2 to hold it in place, when No1`s flange could be used to retain any such fixing to the bulkhead..?
Perhaps bit more levering required in the area of the dummy screw to try to determine what part No 2 plays in the game..?
