Tennis balls are probably the best solution. Before I learned of using them, I used blue painters' tape wound around the gutters, extended beyond the ends. Stayed secure all winter yet did not leave any glue when removed in the Spring.
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2015 Shamrock 23IKSS, Oyster shell
2019 Chev Silverado LT Z71 Ext. Cab, 4x4, 5.3L V/8
Reese Straight Line WDH, 2000W Honda Gen.
2 Old Town kayaks & 2 Boston Terriers - Zoey/Gonzo
Lar & Ruth
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