The kicker is held in place behind the discs, while the stoppers are held up against the discs, locking them into place. The kicker and the stoppers are both connected to springs, which hold them in a standby position. The second shaft also supports a series of connected stoppers, teeth that lock into the notches on the discs. The kicker paddles are lined up so they can push against the notches on the three discs. A second shaft below the central shaft supports a kicker, a piece of metal comprising three paddles. The central shaft also supports three notched discs, which are connected to the three reels. Most models include three reels mounted on a central shaft. There are any number of ways to arrange these elements, and manufacturers have tried dozens of approaches over the years. A coin detector initially registers that a coin has been inserted and unlocks a brake so the handle can move. A braking system brings the spinning reels to a stop, and sensors communicate the position of the reels to the payout system.

This shaft is connected to a handle mechanism that gets things moving. The central element is a metal shaft, which supports the reels. The classic slot machine design works on an elaborate configuration of gears and levers. The amount you win - the payout - depends on which pictures land along the pay line. If each reel shows the same winning picture along the pay line, you win (certain single images are sometimes winners as well). Winning or losing is determined by which pictures line up with the pay line, a line in the middle of a viewing window. The player pulls a handle to rotate a series of reels (typically three) that have pictures printed on them. The classic mechanical designs have been almost completely replaced by computer-controlled machines. The technology of slot machines has also changed a lot over the years.

2.2 In-House or Proprietary Progressives.

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