Try not to ever guess on your threads...the internet has all of that information:
This is a European measured chuck sku 23062: http://www.mikestools.com/Supernova2-Chuck-23062-Super-Nova-Chuck-M33_23062.aspx
Hope this helps!
Who has what, the chuck? I gave a link. Are you in the States?
Larry - add to an internet search NOVA 23062, and you will find retailers who sell this product.