The most convincing switching device I have ever seen is the amazing Devil’s Mail Box by Thayer and later by Owen’s. It is so clean you really can’t believe anything has happened. After the initial success of the original design Thayer released a new version attributed to Len Sewell and called The Devil’s Card Rise (sometimes the Mysterious Card Rise). This new device really is a marvel.
When I received this item it was a little worse for wear and did not include any instructions so I created my own based on the the original Devil’s Mail Box instructions, the advert and Thayer’s Rising Card instructions in Vol. 2 of Glenn Gravatt’s wonderful compilation of Thayer instruction sheets. Dr. Albo shows the prop in a video for the Ultimate Thayer, but doesn’t actually perform the card rise feature or mention any specifics. That being said after an afternoon playing with various approaches I’m confident I am very close.
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