When they said of the Seb's lock that it will tend to move across the blade tang and "settle-in" at a certain point, where it doesn't seem to pass. I've been EDC'ing a small Seb since Feb. '02, and this has been my experience.
All of this is affected somewhat, of course, by takedown and reassembly. You'll likely tend to notice that this process will reset the position of the lockbar further back, as if turning back time. There may be some truth to this if your stop sleeve is marred from use, in which case a slight rotation to an un-marred section of the stop sleeve where it meets the blade tang will usually turn back time.
Either way, I've long lost the bet with myself that I'd wear out my Sebenza's lock; that it would wear all the way across and develop play. It's settled in at about 60-70% total travel, even after years of use.
I know it sounds stupid (and probably is stupid), but I keep a second Sebenza put away in the instance that my EDC has to return to the Motherland for any repairs, etc. To date it has not.
Professor.