...like they say...if you cant run with the big dogs stay on the porch with the other cats...AL must have taken akin to rust...although AL-Aluminium is remarkable for its ability to resist corrosion due to the phenomenon of passivation and for the metal's low density in this case it wasnt rust(y) resistent...phenomenons happen every so often;)...and there is about to be one in the trough of good and plenty...gofo and g'day