In a standard draw bar environment, the cork is fixed in place by being glued to a metal plate, while another plate (the spool face usually) spins against it. The plate it is glued to helps reinforce the cork and helps the cork retain its shape, and keeps it from tearing. As I'm sure you know far better than I, cork is amazingly resilient, yet fragile in the thicknesses we're talking about.
I look forward to seeing how the nautilus holds up over a couple of years on the market. Believe me, I hope it works. I'm just not ready to personally trust it. But hey, I'm not your market demographic. I stick to my standard arbor, undrilled, Billy Pates and my Abels, though I did take a flyer and buy a Tibor after they proved themselves for a couple years :chuckle: