Incredibly easy- you will even amaze yourself!
First, show that the coin holder con be pushed right through the case.
Next, place the spike down through the middle of the case and through the holder.
Now the holder can't be removed from the case, because the edge of the holder gets caught by the spike.
AND NOW FOR THE MAGIC!
Place an ordinary penny (that you can even borrow from your spectator) into the holder.
Slide the holder into the case-
the penny is clearly seen going in one side of the case and coming out the other!
RIGHT THROUGH THE SPIKE!
This can be repeated over and over!
NO SKILL NEEDED!
The holder does all the work for you!
If you can slide the holder into the case, you can do the trick!
WARNING: CHOKING HAZARD. Do not put the spike in your mouth. Not suitable for children under 5 years of age.