Stephen, I have that LN Joined Chest DVD so I'd seen that version before.
But I hadn't seen the Paul Sellers YouTube video where he cut mortises (behind glass) with a Pig Sticker "Mortise chisel versus bevel edge chisel" and mentioned that he'd taught over 3,500 students to do it that way.
Thanks for the directions. Roy does a really nice job of showing the power of the pig sticker. I have a 5/16 mortise(pig sticker) chisel that I have used for years and I love that thing for good straight mortises. In a pinch, beveled chisels can work but they do twist a little when I pound them. I guess I just love the mortising chisel and I stay with it. I tried some of the inexpensive Narex mortise chisels and I think they work very well and they hold an edge quite well. They seem like a good value. Maybe some others have a chisel they like?