As I am sure you realize, the front of the Century 1.6X has a front diameter of 105mm. So you need what ever hardware required to adapt to a lens of that diameter. I am sure that a dealer like EVS or the distributor 16x9, Inc in Burbank Ca can tell you what is required.
On the 16x9 site, there is a pancake adapter (Adapter plate) called the 420-04, that converts to 85mm. I have to call them and find out which one converts to 105mm, I think the 420-05 or 420-06. Here is the link to the blowup diagram: http://www.16x9inc.com/chrosziel/dvcine/dvx/411-53-PK/itemlist.shtml
Tim please email me and remind me to do this. This product totally slipped my memory earlier.
Bill, you guys should seriously consider putting useable threads on the 1.6x.
I'd love to put a UV filter on this to protect the glass but, as it is, there's nothing to prevent the glass from getting scratched in the field. This was a pretty hefty investment for me and I'd like a little peace of mind knowing I am protecting that investment.