David, I think the diamond stones in the videos are being used because they have them. I was able to get a quality edge using just a new mill file. That said, I'm convinced that a better edge is possible with better honing of the surface.
In one of the other threads I posted a vid of a Lapping machine that uses peel and stick adhesive sandpapers. That machine cost $599. The hands in the vid speak volumes, cracked, worn, the hands of a crafstman. So, the length folks go to is amazing to get these scrapers tuned up and working.
Comments from others getting suitable burrs using only a file and burnisher are scattered through the threads. It seems to me that wet sandpapers would be perfect here, honing that edge, much like we do using scary sharp techniques. It's possible too I suppose that unjigged smoothing could actually damage the edge of the scraper just created in the filing.
I did like the file holder and the way he clamped the card scraper into the wood vise. Those two parts of the equation assure squareness and lowers deflection of the thin scraper. Today, I'm headed for the hardware store to see what is avalable locally and plan to pick up the Red Devil Paint Scraper shown in one of the other vids. Of all the thousands of dollars of equipment in his shop, it's his favorite tool. I'd say he's a believer in a scraper's value, it looked perfect for working wood bindings. Won't know until I try it.
Happy Filing, Burnishing and Scraping everyone! 
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