I was going to say just lay something on top of it. The ones I’m using don’t turn that easy, nothing to worry about. But Linda has a perfect solution. A little zip tie will solve the problem. Using mine though, you might have to staple the zip tie to the floor each year, or hold it down with a washer under a screw, because I think the handle goes perpendicular to the water line…or maybe crossing?diagonally?over the water line would do it.?
Let us know what you end up doing.