It's nice that they advertise that their product won't damage the floor because the bottom of the screw isn't long enough To scratch the issue is that my bolt was too short so when I put it in the wheel the bottom didn't stick out enough to fit a nut to secure it to the base. Hardware store and got a longer screw but because the screw is thinner than they use the wheel wobbles a bit when the door opens but at least it works.
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