Here are some basic tips on how to keep your Expanded Shell in its best condition:
When not using the Expanded Shell, always keep it over a regular coin. This will ensure the Expanded Shell does not lose it's shape.
If a coin gets stuck in the Expanded Shell, DO NOT shake it inside a glass. That will only damage the coin more. Buy a Bang Ring
and use that to take the coin out.
Try not to drop the coin, that will damage the Expanded Shell .
If the Expanded Shell has a small dent in it, use a wooden dowell to re-round the edge of the Expanded Shell. You can also put a coin inside the Expanded Shell, and roll it on a hard surface. Then use a Bang Ring
to get the coin out of the Expanded Shell.
To further expand your Expanded Shell, put a dollar bill over the mouth side of the Expanded Shell. Then push an English Penny
inside the Expanded Shell. Pull out the English Penny
using the dollar bill or use a Bang Ring
In my experience, this is what I have found:
Todd Lassen > Schoolcraft > Johnson Magic > Tango Magic > Sasco
Those are the main coin gaffers, but there are many other custom guys.
~World's Greatest Magic
~Total Destruction DVD Set
AND MUCH, MUCH MORE