@boxer12. Ok, so maybe you can answer me this....how do you know that the stylus on the old cartridge with unknown amounts of usage, is not worn out?( to the point of doing damage on the first play). Taking the cartridge to a ‘professional’ has not been productive,IME. I don’t think there are too many people who actually know what the correct shape and faceting of the diamond is supposed to look like. Plenty of folks are willing to guess at it though.
Please do tell us exactly what you are looking at when you ‘inspect’ the used cartridge.
Please do tell us exactly what you are looking at when you ‘inspect’ the used cartridge.