I am using quarters. I wanna learn it with quarters so I can always be ready.
My classic palm is about as good (or bad ggg) as my DL. It works good about 85% of the time

Unfortunately the trick would be ruined about 2 times in 10
When I practice the first 2-3 minutes its terrible then it gets better, but sometimes it seems to come and go. Now I am talking about making a fist and then putting the hand on the table - not just keeping the coin in the palm
Some other problem I had is that when I wiggle my thumb I feel it coming out of position
Was wondering it this is an easy thing to do or have others had difficulty with it as well