Update: I contacted Benchmade and they won't accept the knife for refund or reimburse the shipping charges, but they have offered to try and fix it again or exchange it for another one and pay for the shipping the next time around.
Update: Bradley won't have anything to do with me. The representative had this to say about it: "Since you didn't buy the knife from us and technically we didn't build it, we can't reasonably be expected to do anything about that, assuming there even was a defect and the problem was not caused by the end user..." After some talking they decided that "Okay you can send it to us, and if we are able to determine with certainty that there was a defect, we might be able to arrange to exchange it for a new one, but that's the best we can do."
Update: The company I bought it from was sympathetic, but they weren't willing to offer a refund due to the amount of time which has passed (payment for it was sent in Nov. 2011) and the fact that it has already been used, sent in for repairs, etc. They did offer to deal with Benchmade (regarding any further repairs or replacement) on my behalf and cover any shipping charges that would entail. They remarked that they have done this a few times in the past with Benchmade knives.
I guess my best option will be to arrange to send it back to Benchmade again and hope for the best.