Its just as easy to use either suggestion, an ex**nded sh**l or a locking coin uni**e type gimmick.
Using Michael Vincents technique from his coins across would also allow a locking set to nest together perfectly in a spectators hand , and all done by the spectator themselves.
There are certain advantages for each type. A locking gimmick would allow (if it is well made) the spectator to check the remaining coins themselves, so this approach would be suitable for certain effects. Using an exp**ded sh**l has the advantage of the sh**l still being in use, which is essential for certain routines such as the Michael Vincent routine mentioned. So which method would be best is entirely dependant on the particular routine.
I will say this though, and this is not directed at Danny personally. Seeing another performer and lifting their material for your own use is not the way to go. This thread is basically someone asking us how another performer did an effect so that they can then go and use it themselves.
jim