Falls off crib

I purchased one, thought the plastic screw not fitting was a one-off issue. Ordered a replacement and the same thing is wrong. There is a large plastic screw in the bottom that holds two flat circles together to clamp the mobile onto the side of the crib. But the piece that receives the screw doesn't actually have any threading or any lip for the screw to grab onto. I tried putting on the crib thinking the weight would keep enough pressure to not wiggle around and it just fell apart. Do not purchase unless you are ok with permanently gluing or duct taping the thing onto the crib.

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