As other reviewers have noted, the holes in the flange are not slotted as shown in the picture. Both of my discs wobbled quite a bit when placed on a flat surface, so I sanded them down with a belt sander to show the burrs on either side (see pictures). Also, I was missing a big chunk next to a page's ID. I ended up putting them on a belt sander for some time to get an acceptable area to seal with the gasket. After that they got along well. As mentioned, the hardware package is pretty much useless for this application as the screws really aren't long enough.
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