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I tinkered with the file a little, I added built in rail buttons, eliminating the need to either print thingiverse rail buttons or buying them, as well as eliminating a nut and screw. I know that not having the metal support of a center screw might be an issue, but I made up some for that by making the rail button an oblong, to give more body for strength. I am attaching the solidworks and STL files.