Here is Doug's reply to my query at Bladeforums, which I hope he does not mind me reproducing here. Looks like Bogdan was on the right track:

http://www.bladeforums.com/forums/showthread.php?t=349884&page=3&pp=20

"Some folks prefer a neutral balance, other prefer having blade forward. Using a very simple method, which I cannot yet reveal, we can offer both options in the same knife, allowing a user to adjust it to suit their own preference. This concept is not new, but our very simple, low cost and easy to use implimentation of it is, hopefully. We are in the process of doing the necessary deeper and more thorough intellectual property research as we speak."


Regards, Vince