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Just got a used DSLR off of craigslist. How come whenever I attach the lens hood, it makes the most awful grinding sound as I try to screw it in? Then removing it is a pain in the ass as I'm twisting over and over waiting for it to unhook. What's up with that? It sounds like nails on a chalkboard. It's some generic looking lens hood and a Canon 18-135mm lens.