Here's another way. Open the image and duplicate it. Over smart sharpen the duplicate a lot, like way over sharpened. Then go to the menu select layer/layer mask/hide all. The over sharpened image disappears. Make sure the duplicate and layer mask in the layers pallet is highlighted. Now get the brush tool with colour set to white and adjust brush diameter to suit. Paint in the areas you want to sharpen. Now adjust opacity on the sharpened layer to suit. Flatten.
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