Simple idea but falls about 10 miles short of the goal

Such a simple idea that simply does not work! I have a king size split adjustable bed. I purchased this to hopefully take care of the separation between the mattresses. It does not work. I even have the strap (to hold the mattresses together) as tight as I can get it but all it does is fall down in the crack. Even just rolling over it shoves it down in the crack. Maybe if the pieces on each side of the fill piece were drastically larger it would work.

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