Martelli stands behind their cutters. I've had their 45mm lefty since it came out. I purchased a 60mm late last year and was disappointed it was the old mechanism. I thought I was on a waiting list for a new mechanism 60mm lefty cutter to replace it and after following up, found out they have too many lefty old mechanisms in stock & did not plan to make the new one. So, due to the misunderstanding they sent me a new 45 MM new mechanism for my troubles, no cost no shipping. Can't beat that!