The other issue that seems to be overlooked is the aging of the cartridge suspension. These components may even wear out prior to the stylus and are IME very hard to determine by a general eyeball inspection.
The question then becomes as to whether the used cartridge is performing up to spec and what the overall loss of information and distortion is due to suspension age?
The question then becomes as to whether the used cartridge is performing up to spec and what the overall loss of information and distortion is due to suspension age?