If you do many natural edge bowls drill out a couple holes in your faceplate and install 3/8” bolts on the face plate after sharpening the bolts to a point. Place the blank (bark side up on the ways. Center the faceplate on the bark and smack it a few times with a mallet. Drill two 3/8” shallow holes through the bark. Place the faceplate back over the holes and drive it into the holes. Mount it on the lathe and secure it with the tail stock. Here’s a video I did for YouTube on natural bowls. It may help with your questions.
https://youtu.be/4bYWW4rXaYQ
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Member Illiana Woodturners