I recently traded for a CK&T MA. The knife was basically unused, and in great shape. After using it for a few days, I wasn't satified with the lock engagement. I sent an e-mail to CK&T explaining my concern, and also explained that I was a second owner with no receipt. Tom from CK&T replied that he didn't care if I was the first or tenth owner, that the knife was guaranteed for life. Tom told me to mail it in, and it would be fixed. Yesterday, a brand new CK&T DA was delivered to my house. Needless to say, I was floored by the generousity of Tom, and Cutters Knife and Tool. The new knife is in perfect condition. It has no blade play, and the lock is absolutely perfect. I was so impressed with the quality of this knife, and the quality of CK&T's customer service, that I just ordered a Kerambit from Tom. Tom, thank you again.