Levelling the game and setting the slope

Steps

• Lay a long level across the cabinet near the backbox and again at the front (or a small level on the playfield with the glass off).
• Adjust the leg levelers until the game is level side to side; even a slight lean pulls the ball to one side.
• Set the front-to-back slope; the game manual gives the maker's figure, and many owners raise the rear for a faster game.
• If the flippers can no longer get the ball to the top of the playfield, lower the rear a little.
• Recheck side-to-side level, then recentre the tilt pendulum in its ring, since changing the slope changes the tilt.

Systems

• Williams System 3
• Williams System 4
• Williams System 6 / 6A
• Williams System 7
• Williams System 9
• Williams System 11
• Williams System 11A
• Williams System 11B
• Williams System 11C
• WPC Alpha-Numeric
• WPC Dot Matrix
• WPC Fliptronics
• WPC DCS
• WPC-Security (WPC-S)
• WPC-95
• Bally MPU AS-2518-17
• Bally MPU AS-2518-35
• Stern MPU-100
• Stern MPU-200
• Bally 6803
• Gottlieb System 1
• Gottlieb System 80
• Gottlieb System 80A
• Gottlieb System 80B
• Gottlieb System 3
• Data East CPU Version 1/2
• Data East CPU Version 3
• Data East/Sega CPU Version 3b
• Capcom
• Electro-mechanical

Source: Pinball Machine Care & Maintenance, Bernard B. Kamoroff (Bell Springs Pinball Alley)