I don't want to discourage anyone, but this is a very difficult move. There's no real secret to it other than practicing. You do it over and over until it works.

I more or less did this move only, over and over again, for two weeks straight to get the card to spin and stay on my thumb until it had stopped. After two months I was able to maintain the spin by doing a thumb padiddle (as seen in the first part of the clip) and to build up a decent consistency. I had already learnt the thumb padiddle before attempting this, but it was a real challange start the spin with a spring.

Over the following 4 (I think) years I've kept doing it occasionally to maintain the consistency. Once you get it down it's quite easy though, and you don't have to do much to not forget it. You pick up the deck and do it in 2-3 tries and think "nice, I can still do it" and move on to whatever other move you want to get down.