My cap has been stuck in the past as well, Once I used a plastic ruler and just shoved it up, didnt scratch. You could also try a screwdriver with a thin towel over it not to leave any marks. I just took a screwriver when it wouldnt budge to the back of the cap and popped it off, you can only see a tiny scratch if you crawl behind the kegerator and look very closly.
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