I personally think the snap change is done badly by a lot of people, as it can be done slowly and still look good if done right!
I assume we are talking about the snap change where the cards are held between the thumb and second finger at one of the short edges and snapped and the card changes........
If we are talking about the change done by David Blaine (don't know what that's called but it's nice) I will shut up!
I was in the local magic shop today giving a demo on this very slight to a young magician and it is not just bikes that make you get it right but technique! Although bikes do help enormously.
Those that suggest that the use of better cards will cure your problems are forgetting that they probably adopt the correct technique of this slight without thinking about it!
You should be able to snap the change and show it as one card without going anywhere near the deck and it should still be convincing, done badly and you would have to get the cards on the deck asap to cover your spreading card, which would look terrible!
The correct technique is very simple.....you just make sure that immediately before the change happens.... at the same time as you bend the "card" to prepare for the change, that the first finger and thumb squeezes the corner of the "card" , it's that easy to get it right!
The mistake a lot of people make is that they leave it too late to catch the corner and end up trying to align the cards, but they will move about as you know!
Just try to move the first finger that bit earlier to the corner and sqeeze the card against your thumb and it will stay aligned all day if you like, provided you squeeze hard enough!
