@Resonant11 - if you intend to use Normacorc wine closures you need to pay attention to
@cmason1957. My own experience, having used Normas (Reserva) for MANY bottles of wine, is the Italian floor corkers (brass jaws) strike a channel in the side of the cork when compressed. Wine drips from this channel. Although every cork suffers, not all bottles drip. However, if wine is dripping, you're at risk of oxygen ingress. And, the wine side of the closures curls up and out on the end. AND, you'll still get that top indent you mentioned in the OP. Those Normas are just so dog gone hard to compress. I personally cannot speak to the Portuguese floor corkers (plastic jaws) and their affect on the Normacorc wine closures or their general use overall.