I don't know if you all know this trick already?
It hasn't been brought up during any of the filing discussions and Gerry doesn't mention it in "Fundamentals", so I'd guess not.
If you do, I'm sorry for wasting your time.
You'll notice that I ream the bottom of the vertical cut out a little. This is not strictly neccessary, but it keeps the chain from binding against the side of the cut.
It takes a little practise getting the height of the front piece of wood( the one holding the bar) right for the particular saw you are filing, because you can actaually cosumize the stand to fit both the saw and your own height.
If you can't figure it out from the pictures alone, I'll explain more.
As you can see, I have gotten old enough to need glasses for filing a saw