Last week I turned a bowl from a lovely piece of Imbuya. There was a small tool mark on it, which I thought would sand out but mindful of a post here I took that last cut. Yep, I got a horrible dig, the bowl flew off the lathe and when I examined it there was a deep gouge on the inside and the dovetail recess had broken. I put the piece on the scrap heap. Today being at a loose end I reverse chucked it and cut a new dovetail recess only 2 mm deep, to my surprise it held in the chuck no problem. I now have a nice bowl with vey thin walls and no recess. Can't show a photo as I don't have a camera.
Tom