Tutorial - Mating HerringBone gear in SolidWorks?

Here is the tutorial.
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Step 1:
Open the attached file. Click Mate.
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Step 2:
Under mechanical mates click Gearmate.
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Step 3:
Select the faces of the teeth.
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Step 4:
We can see that SW has automatically analysed the teeth/diameter.
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Step 5:
Click OK and the mate is generated.