I have taken mine apart to address a blade rubbing issue. It went back together with no problem and functions better than it did.
I look at my folders like a firearm. I want to be able to break it down (if construction pemits) to know how it functions. I generally don't concern myself with warranty issues. I have blown enough money on knives, that I don't worry about sending a knife back for repairs. If I can't fix it, I will trash it or have a buddy work on it for me. No, I'm not rich and I am not suggesting others follow my lead. This is just my view on the warranty issue I have developed over the years.
I have never had a knife from well known company go back together and not function correctly or function as well as it did. Most knives, if reassembled correctly, should function the same as before. If there are issues, most likely it isn't the fault of the knife.