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Here is a case for people to learn from the fool's mistake. Sometimes I would get lazy and not brush the snow off the cover, letting it fall off when the cover got to its vertical location. With an inch of dry powdery snow, no problem, But with an inch of wet snow, the cover weight probably doubles puts a huge strain on the cover lifter breaking it and cracking the tub's skirt.
. If ours start to look at all flushed in the face, we make them get out. Ours can tell us when they are hot, but won't always admit it! So have fun and be careful!
120 ft? That might be a record for poeple here. Top on my list during installation planning was shortening that distance as much as possible (10 ft in my case)