Turning the legs
After crosscutting the walnut beam into a portion that matched the approximate length of the legs, Mark resawed it into four parts. Then he placed each part in the lathe, and because he knew that the walnut was somewhat moist (we checked the moisture content and it was around 18%), and would shrink and possibly deform later as moisture migrated out, Mark turned the legs into wider proportions than his intended design indicated.
But the legs were not afflicted only by wetness, they were also a vibrant habitat for insects and fungi. We concluded that the best way to deal with both afflictions was to microwave them. Yes, microwaving is the way to go with small parts that are suspected, or proven, to be infested with bugs.