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Playfield glass sizes

Playfield glass is usually 3/16 in thick. Until about 1990 nearly all games used 21 x 43 in. Some 1980s Gottlieb games and many games after 1990 use larger sizes. Bally games with a hinged metal glass frame usually take 21 x 41-1/2 in. Clean it with glass cleaner or a damp cloth.

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