Beg all you like... 'None', in this case, is not a contraction, it is a pronoun meaning 'not any' and can be singular or plural. However it's used, 'none' never has an apostrophe.
Say it out loud. "the screw slots are aligned". "the screw slots is aligned". Which one sounds right?
Say it out loud. "the screw slots are aligned". "the screw slots is aligned". Which one sounds right?