RAUL disagrees with you, Chak —
"That tiny hole at the inner position in the SS300 is not to fix it to the spindle. SAEC makes a research about and they found out that the LP/records tend to slide through a metal mat surface so its advice is that with a small nail use that hole to fix the LP to the mat and for this you have to make a tiny hole on each LP at exactly the metal mat hole position then and before play you insert the tiny nail in the LP through the metal mat hole. In this way the mat and LP spins at unison/evenly."
Neither seems worth the bother to me, or even the few seconds to think about it. And note it could be done with any other mat regardless of the material, and no one ever bothered.
"That tiny hole at the inner position in the SS300 is not to fix it to the spindle. SAEC makes a research about and they found out that the LP/records tend to slide through a metal mat surface so its advice is that with a small nail use that hole to fix the LP to the mat and for this you have to make a tiny hole on each LP at exactly the metal mat hole position then and before play you insert the tiny nail in the LP through the metal mat hole. In this way the mat and LP spins at unison/evenly."
Neither seems worth the bother to me, or even the few seconds to think about it. And note it could be done with any other mat regardless of the material, and no one ever bothered.