When a hustler "puts a fix on a deck" (a term I heard from an owner of a popular cardroom, in New York) the whole thing can be disrupted when the sucker cuts the deck. There are many ways to circumvent the effect of a cut, such as using any number of sleight-of-hand moves or working with an accomplice, but the best way is when the sucker cuts exactly where he/she is supposed to - a procedure commonly referred to as "forcing a cut." The most widely known way to force a cut is to put a crimp or a bridge on the cards. This works quite fine with paper cards, but not at all with plastic playing cards. There are a handful of ways to force a cut when plastic cards are used and the best way I know of is to use beanies.
I'm sure some will be frustrated to learn that I don't intend to expose the secret of this gaff. I'm also sure others will be relieved that I had made this decision, as this is still a gaff used by professional card hustlers. I will say, however, that beanies are most often used to cheat in self-dealt poker games, but other card games are not excluded.
Due to the fact that I do not really want to expose this gaff I am only showing a closed box. This box actually contains an assortment of beanies. They do not need to be stored in a box like this, of course, I've seen one hustler that keeps them inside of a miniature screw-top bottle (that may have been a perfume bottle in its previous life). I will also say that beanies come in all "shapes and colors" but I will take the credit for making an improvement that I have only shared with a few people and sworn them to secrecy. After all, secrets do need to be shared, but not by spilling the beans (excuse the pun) all over the internet.
Since they do not have a 100% assurance beanies are in essence a percentage gaff. But with experience the percentage can be pretty high. Once again, I will not discuss details, but it suffices to say that an experienced poker cheat only needs a small advantage to accomplish the desired result, which is to take money by the time the game ends. When one works with a percentage gaff it is totally irrelevant if the gaff works every time. At the end all money is the same, weather it was acquired in increments, or all at once, is totally irrelevant.