Wait, why would it wear out the guide? In the picture he has a long rod clamped to the file. The rod is what sits in the guides and the only contact the file makes is with the knife. So all he's doing is picking one of those holes to stick the rod(that is attached to the file) into. Then you can do exactly what Ray said.
Check out trollsky on Youtube and watch his video on grinding a bevel when you are able. That's where I saw the jig for using a grinder.
Also, sorry for putting the pictures in the wrong order. Ray's right, the first jig was for using the grizzly and the second was for hand filing.
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-Hunter
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