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Q: front windshield wipers stopped working on 1998 Oldsmobile Silhouette

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
The hex thread assembly on the motor crank arm keeps loosening, causing the whole motor crank arm assembly to slip off the motor. Other than continuously tightening the bolt,what are the options?
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