Enjoy this simple and surprising tale from The Games Room Company, who were tasked with restoring a roulette table operated in Chicago throughout the 1930s: "we found that it had been completely rigged to defraud people and increase the odds of the house during play."
A button disguised as decorative screw, accessible to the croupier, would cause tiny pins to emerge from the ball track's surface, deflecting balls toward house-friendly ball pockets. Powered by batteries hidden in the legs (and dated by the newspaper used as dampers) the mechanism and its results would be undetectable at speed.