Retracting agricultural sprinklers.
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Previously:
https://www.homemadetools.net/forum/...619#post197547
https://www.homemadetools.net/forum/...663#post212754
https://www.homemadetools.net/forum/...024#post164583
https://www.homemadetools.net/forum/...397#post116793
https://www.homemadetools.net/forum/...379#post196573