Went to pull the radiator today, got evey nut and bolt off besides this pesky one. Its got a rounded head of the bolt and a square nut on the back. How can I get this off? Sorry if it's an easy solution.


[IMG]http://imageshack.us/a/img29/3861/img20121022133446.jpg[/IMG]


And here's what I think the damage is to the radiator that made it burst:


[IMG]http://imageshack.us/a/img703/8700/img20121022133452.jpg[/IMG]