After getting beaten up by the plywood, I really do feel better that I managed to set in 8 perfect mortises for the mating lock plates using hand tools only (sans power drill ) for the four-post bed. Working with the pine was really nice and I was 100% satisfied with the results. By the last mortises I had it down to about 12-13 minutes a piece. Very happy for a short afternoon in the shop.
Here’s a quick demonstration of how I went about it.