Cartridge is the thing on the end of the tone arm, which is the arm that goes over the record that is spinning. On this cartridge there is a stylus (usually) which holds a needle that goes onto the groove of the record, and is moved around to pickup the sound of the record, for instance by the spin.
The gouges were so deep it looks like some one would of had to of sat, by that I mean placed their butt, of their body, their glutinous maximums, on top of the cartridge, then moved around while sitting. The look of the gouges indicates scrapes that plastic is not capable of so it would of rather required metal.
Elusive disc has yet to contact me, but I am not sure if they got the Vinyl I shipped back yet or not. They did say they will replace it.