The threaded area is not actually part of the cooling head as to say its not all one piece. If you take the screws out that connect the cooling head to the engine block, you can remove the button between the cooling head and engine block. You can now get a better look at the threads to see if they are stripped. If they are you replace the button. Be sure not the loose the shims between the button and the engine block. When you reassemble your engine make sure to use a little thread lock. (high temp. thread lock. Hope this helps.