A tip that will extend the spin of your pirouettes

(Not talking about the padiddle) I've been playing around with pirouettes and seeing how long I can go with them and I accidentally came across this. After you spin the card and it's spinning on your middle finger, once it is spinning in a stable manner, curl the top joint of your middle finger in slightly so the card is kind of spinning off your nail (you need a bit of nail for this). Since the surface area contacting the card is really small there is little friction, so it will spin for longer but it won't be that stable so you need to keep it pretty still!

I'm not actually sure if it's contacting the top of my fingertip, right before the nail, or the actual nail, but it certainly does prolong the spin.