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"This is a problem we all have at times,  me included. I don't think, Jared, the previous user \"idiot\" tightened it on purpose ! Somehow these rings seem to tighten themselves. I haven't tried Robert's canned-air trick though sounds a good one. Whatever method is taken, I suggest covering the lens element with some protective tissues and perhaps some stiff card. It's all too easy I've found,  to slip when using pliers or whatever.\n \n"
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