Need tips about removing gas cap

[dmjlambert]

Yes. The cap moves slightly inward when I do, I think it is the rubber gasket compressing. So I don't know why it won't come off. It is cold here, so at first I thought it may be frozen on. But I pointed a hair dryer at it for about 15 minutes, and it is nice and summer-warm now. It will not come off. I tried pressing on it and then turning the key, pressing down on it while turning the key, and turning the key and then pressing down on it. I tried pressing up to return it to being centered on the neck, and it will not move in that direction. I am thinking of hitting it with a wood block.