How to position inner path hexagon center in checkbox?

Question

I have created a ControlTemplate for checkbox using multiple path geometry. The code for the ControlTemplate is as below.

 

I want to position the inner hexagon in center of the outer hexagon, I am not getting how to do that. I tried using Margin but its not working to make it perfect center.

<ControlTemplate x:Key="checkboxTemplateHex" TargetType="CheckBox">
     <Grid>
        <Path x:Name="Equis2" Opacity="1" StrokeThickness="1" Stroke="YellowGreen" Fill="Transparent" Data="M7.99999993117449,0.5L15.4999998937224,4.25L15.4999998937224,11.75L7.99999993117449,15.5L0.499999968626539,11.75L0.499999968626537,4.25z"/>
        <Path x:Name="Equis" Opacity="1" StrokeThickness="0" Stroke="YellowGreen" Fill="YellowGreen" Data="M5.5,0L10.999999995477,2.75L10.999999995477,8.25L5.5,11L4.52300163988895E-09,8.25L4.52300019659901E-09,2.75z"/>
        <ContentPresenter Margin="0" HorizontalAlignment="Left" VerticalAlignment="Top"/>
    </Grid>
</ControlTemplate>

 Using this ControlTemplate as following

<CheckBox Grid.Row="5" Grid.Column="1" Template="{StaticResource checkboxTemplateHex}" FocusVisualStyle="{x:Null}" IsChecked="True"/>

 Following is the output