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Kennywood Park's Thunderbolt roller coaster has rumbled and rattled thrill-seekers since 1924, plummeting 95 feet at highway speeds on a lattice of birch timbers. Keith Kuzma affectionately calls those the "nuances" of the creaky coaster he mends early each day with new bolts, timbers and grease -- lots of grease -- before thousands of people flood the historic West Mifflin amusement park.
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