In this video I explain and show you how to make a LONWORTH CHUCK for turning the bottoms of bowls. Seeing it, is believing how easy it is. Only difficult thing, is to be able to divide by two. even then you could just guess the center of two lines. I didn't make one for years as it looked difficult, actually easier than falling off a log.. Works well, costs very little, adapts quickly to the size of your bowl, can be made to fit any size of lathe. I love it, you will too.