Chris told me a story recently about a customer that had had his Sebenza for just a few weeks before the knife was returned to his shop for evaluation. Apparently this particular Sebenza was a gift from this fellows wife so probably not the same person as the OP and I only relay the story as it has a familiar tone. Chris went on to say how the Sebenza arrived at his shop and he imediately knew, after inspecting it, that the knife had been 'abused' or 'flicked open more times than one could count' in his words.
This resulted in the lock bar being marred/dented to the point of needing to be replaced. He said the customer adamantly denied any such abuse and that there was no way he could have been responsible for the damage Chris was seeing.
He went on to tell me,in his usual passionate way, about how he can tell immediately what kind of life one of his knives has lead just by inspecting the lockbar alone. He went on to say how he has had many a conversation with other frame lock makers/manufacturers and that they all agree that flicking the knife open will damage the lock bar. The more it's flicked the greater the damage.
I have been to Chris' shop a few times, my sisters horse ranch is only a few miles from it, and had great encounters with him, his family, Heather and the whole gang.
Chris is, if nothing else, passionate about making knives. He has lived and breathed it for many years and he knows his product as well as you and I know the back of our hands.