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Here comes the hard part. Use the Liquify Filter(Filter > Liquify). Use the Forward Wrap Tool (W) with the following settings:
Brush Size: 85
Brush Density: 50
Brush Pressure: 100
You should move the brush up and down in a zig-zag pattern as shown in the picture below. You may need to do this more than once to get a better effect; also try and loop once in a while to simulate wood knots. Press the Ok button when you think you are done.
Don't worry if you don't get it the first time, you'll get it right with some practice.
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