Husqvarna chainsaw questions

Some threads get even better when they're hijacked.

Being a cheapskate, of course I'm using the illustrious Horrible Fright chain sharpener, but sometimes I wonder if I'm doing more harm than good!

Can somebody explain to me a foolproof way for setting the depth of the cut? How far down on the tooth should you take the wheel?

And how can you be sure that you're taking the same amount off the teeth in both directions?