Are there hard numbers available on the number of failures from usage as I described? If so, I'd love to see them. Also, used as designed is meaningless word play. If I did provide examples it provides an easy dodge. For what it's worth, I have had a framelock unlock under exactly the circumstances described. I honestly can't call it a failure, because I was using almost the exact motion one would use to unlock the knife and the knife certainly didn't break, it unlocked. After that, I stopped using any framelock to whittle. The more I thought about the more it occurred to me that I was avoiding a task to compensate for a design choice on the part of the maker. I did not have such concerns about the vast majority of lock designs, so some time after that I stopped carrying framelocks altogether.