Tutorial - Modeling Chain Drive in SolidWorks?

Here is the tutorial.
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Step 1:
Front plane >> Sketch.
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Step 2:
Draw a circle.
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Step 3:
Extrude it.
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Step 4:
Front face >> Sketch.
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Step 5:
Draw this profile.
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Step 6:
Extrude cut it.
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Step 7:
Select Circular pattern tool under features tab.
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Step 8:
About the circular edge pattern the cut extrude.
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Step 9:
Front face >> Sketch.
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Step 10:
Draw a circle.
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Step 11:
Extrude cut it through the body.
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Step 12:
Click OK.
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Step 13:
Fillet the edges of the teeth.
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Step 14:
Now Geometry pattern it about the circular edge again same number of times.
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Step 15:
We have the drive model.