You just need to experiment and take a logical approach.
By doing that you can figure out that the check box is offset by 3.5 and the box is 9.5 x 9.5
So you subtract 3.5 to align it with the left edge of the cell, then ad 9.5/2 to align the center of the check box with the left edge of the cell, then offset it by half the cell width.
For the height, you can just record a macro while you adjust it and you will find that the property you need is scaleheight
Or you can make yourself a tool like this
Then put a number to the left to be the Top offset and a number to the right to be the left offset...
checkbox.jpg
... and experiment
Then when you have something close, find the best compromise
final checkbox.jpg
Then after a little bit of fine tuning
is your best compromise.
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