I would also like an answer about this. I have discussed this very thread with many people and I did not always start the conversation. There are at least a few people out there who want to know. I can appreciate the fact that Spyderco has great customer service but I cannot accept the idea that I should not be concerned about the design of an expensive knife just because Spyderco will take care of me if it breaks. I just don't want it to break in the first place and I want to know that I can trust it when I need it. If you don't care that is fine but I do not see why you are bothered that someone wanted to know. I'll be blunt, I am glad this thread got bumped because I think that the Mantra has the same style of stop pin (not 100% sure though) and I will not be buying one until I figure out what happened here.
You have never repeated the same behavior and gotten different results? Hmmm... I value determination and perseverance. I think I have gotten a lot of what I have with the old try, try, try and try again approach. Good for you that you can either get what you want on the first try or move on. It doesn't always work that way for me