If they just spin, then the are not screws, but rather bolts with a nut on the back. This means the nut is spinning on the backside. You're going to need to figure out how to get to the underside of the bolts. In the case of the midship cleats, The bolted then on, then installed the headliner. The headliner covers the nuts, so the headliner had to be cut. In my case, one was behind the medicine cabinet in the head, then other was under the headliner inside of the galley cabinets. I lucked out because the cut in the headliner is hidden.
Good luck.
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