Ok, Let me clarify. I am a beginner with using chucks. I just got a supernova 2 that came with the 50 mm jaw set. It looks like the only way you use those is to cut a tenon and expand them out. Lots of you guys seem to grab the foot of the bowl from the outside. i am placing an order. will the 100mm jaws do that for me. I have a jet 1642 so will be turning item that may be up to 14" or so in diameter. Also when you clamp the jaws down on the foot will just 2 points on each of the 4 jaw quarters be touching the foot. I am also looking at getting the cole jaws. That will allow me to refinish the foot out when i am done... correct? What determines whether i should expand the jaws in a tenon or clamp them down on the outside of the foot? Is one more secure than the other. Sorry for all the questions but i want to get the order in to woodcraft for the free memorial day shipping. thanks for all the help. doug