Found something.
http://www.bladeforums.com/forums/s...mzaan?highlight=Lock+bar+stabilizer+umnumzaan
"Those who have followed the nearly 25 years that the Sebenza has been around know we continually make small improvements, alterations, advances to our knives. None of these changes are made to follow a trend, to keep up with the Jones or to tick off our customers. They are done to improve performance, safety or production. That we make a change to the Umnumzaan should not come as a surprise.
The disc has been added to the Umnumzaan to prevent the reduction of tension on the lock. Because the shape of the Umnumzaan handle is a little different than that of the Sebenza, it takes a different technique to open and close. We have found some customers are not willing to learn the difference or perhaps they don’t recognize the difference but, whatever the reason, they think it is necessary to modify the lock tension, thinking the knife will open more easily. This simply makes the knife unsafe. We have had several Umnumzaans returned to us because of lock issues – almost always the customer denies having modified the lock. We can see what has been done, and are put between a rock and a hard place as we don’t want to call out the customer for not telling the truth. The disc is a solution to prevent potentially unsafe modifications.
Please note this disc is not a lock stabilizer as it has been called in some posts. It is simply in place to prevent the lock bar from being pushed out to reduce tension. Our locks are fitted properly to very close tolerances and do not need to be stabilized. And to save further speculation, the disc is press fit into the handle. It is made of 303 stainless steel, and is sandblasted along with the rest of the handle. Because it is not titanium, the sandblasted finish looks different.
Will it change further? Quite possibly. What might these changes be? No idea at this time.
It will be a while before you see Umnumzaans other than the Wilson Startac with this disc. This has to do with our on-hand inventory of machined handles.
We are not planning to add the lock override protection disc to the Sebenza. We do not have the issue of lock modification by customers to the same degree as we do with the Umnumzaan.
Before the question is asked here is a quick reminder of the difference in how to open an Umnumzaan and a Sebenza.
Umnumzaan: slide your thumb straight forward, parallel with the handle, pushing the lug with the top center of your thumb.
Sebenza: push the lug out sideways in a sweeping motion with the side of your thumb.
Since there has been renewed discussion about Idaho Made in this thread, you might find it interesting to note that since March this year, the value of our back orders has almost quadrupled. This would indicate there are not too many concerns about the Idaho Made marking.
We appreciate your loyalty and enthusiastic conversation. We know we can't please all of the people all of the time!
Anne"
