Ron introduces the Natural Edge Jamb Chuck System so you can easily and conveniently remove the tenon on any vessel with an irregular rim. Also, use it to hold vessels near the maximum diameter your lathe Ron introduces the Natural Edge Jamb Chuck System so you can easily and conveniently remove the tenon on any vessel with an irregular rim. Also, use it to hold vessels near the maximum diameter your lathe can spin. Gain that extra 2 inches you loose with Cole Jaws or Longworth type chucks.