When the wheels spun into a winning position in older machines, a lever behind each wheel would slide into place. Attached to these levers were metal contacts, and when they aligned, they activated a circuit that powered the motor. Before doing anything else, they switch to a new game on the same machine and play until they hit a win of any kind. A "double up" feature then flashes on the screen. (This entered the player into a. You can watch a documentary about his scheme here. 4. Top-Bottom Joint. The top-bottom joint was an ingenious little tool used in the '70s and '80s to bilk slot machines. It consists of two parts: The "bottom which is. For all the fancy technology that was added into machines, they still relied on some old-fashioned junk. The monkey's paw (or "slider exploited this. The contraption was essentially a guitar or piano string attached to a bent metal rod. These 11 slot machine cheats range in cleverness, but they all have the same goal: Make as much money as possible. 1. Yo-Yo, this is the granddaddy of all slot machine scams, from which all others were born.