by Michael Jay » Aug 26th, '07, 15:04
There will be a minor amount of thumb movement that comes with the fact that you are curling your fingers in, but the thumb should not leave its position of being held flatly on the hand. In other words, the thumb should not go down and then back up to grab the coin, rather the thumb should remain (mostly) motionless whilst the coin is placed into the grip.
When you first start working on this, you'll find that your hand will become fatigued fairly quickly because you're forcing your thumb to remain in its position, which is very unnatural. It also forces you to build muscles in the hand that normally are not built. While it was many years back, I still remember sitting, watching television doing nothing but moving the coin from thumb palm to fingers and back, over and over and over, forcing the thumb to remain motionless, but I put somewhere around 10 to 15 hours into getting it down to perfection. It isn't easy.
Try this:
Curl you little finger and ring finger into your palm, leaving your first and middle fingers extended. Have your thumb pointing straight up (so that your hand now looks like a cocked gun). Next, put your thumb down against your hand so that it rides on top of the hand and is fully visible from the back of the hand. Now, curl your first and middle fingers into your hand as if you had a coin. You'll see that there is some natural motion to the thumb - that's okay.
But, if you go from the "gun" position, it becomes very obvious that you've changed the position of your hand upon doing the sleight. Going from the position that I've described above, there is no change in the configuration of your fingers/thumb upon completing the sleight and therefore doesn't call attention to a changed hand position. Any minor motion of the thumb will not be noticed, but if you need to move your thumb about to clip the coin, it can and will be noticed by the more astute spectators.
So, yes, you'll get a millimeter or two of motion out of the thumb simply because it cannot remain absolutely still when the fingers curl in, but you don't need to move it (from its position) to get that coin into clip as you'll find that the knuckle between the first flange and second flange of the thumb naturally moves up (about a millimeter or two) which allows the coin to easily be deposited and gripped.
Mike.