I can tell you that I spec out the materials used, pin diameter, pin taper, grouping configurations and soldering characteristics and if at any time the product does not fall within my specs I do not have to pay for it and it is replaced as soon as possible by my factory. The exact manner in which I accomplish this is somewhat proprietary but I can tell you that I pay more because I demand more. That is also why I sell for more than some of the volume/profit based suppliers.