Q: My son was in the backyard playing soccer, and he must have hit a sprinkler head. The sprinkler now wobbles from side to side, and when the water comes on it’s like Old Faithful. How can I fix it?

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We turn this week to mechanical issues, but not the kind related to your setup or your swing. Our focus is sprinkler systems. Fairways have them. Front lawns, too. And while these systems vary in ...