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Be careful not to apply too much force. The steel plug and the aluminum cylinder head can bind up, and it sounds like this has happened to your head. Try tightening up the plug a bit before you try to back it out. This will break some of the crud off the threads and force it forward. Tighten...

I had a similar problem. None of the water spot removers or abrasive window cleaners would touch it. I finally found that NOXON 7 Metal Polish would remove the spots. It takes a little hard rubbing, but the spots disappear. I've tried other metal polishes and they don't work at all. NOXON...

I was on the phone with the factory about 3 weeks ago, and the engineering staff was available and helped me with my problem.