As I understand it, The EDM manufacturing process is a precise method of making a part without distortion. The parts that S&W are using are stamped out from sheet metal. Every stamped out part always has a smooth side and a sharp side. The sheet metal being used is a mild steel so the Dies won't wear out in a few hours and therefore the factory part is not very precise, hard or resistant to deformation.
IMHO after owning Model 41's since 1979 and shooting tens of thousands of rounds through them, the weak part of the gun is its Factory Extractor. Once the Volquartsen part is installed, the extraction issues go away! That has been my personal experience with the M41 for 41 years. Of course if there are other separate issues with the gun, simply changing an Extractor might not be the answer, no matter who's part you install. I am simply addressing Extractor issues.