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For situations like this, I usually get out the trusty Dremel Mototool fitted with a fine cutting disc and cut two opposed shallow slots in the offending item's rim. Then it's easy to remove with a steel ruler and doesn't affect the items future use. Use the ruler as a flat screwdriver in the slots you've cut, and this provides a clean turning force that doesn't warp the threads. In addition to the dirt problem, some of these aluminium items are made too soft, and they warp a little - especially when you try and grip them hard squeezing by hand.
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