Magic Tricks

I was able to figure out the basics of this effect after reading that it uses an old gaffed-deck principle, and then I purchased it. I think the method is very clever, and am wondering if a similar principle can be used to have a spectator riffle shuffle a memorized deck, and keep the fully stacked deck in order? Even if only half the memorized deck stays in order, that could be very useful for some applications when using a memorized deck! Congratulations Lloyd Barnes and Craig Petty!