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Message: <blockquote data-quote="hollis_f" data-source="post: 1269279" data-attributes="member: 14566">Ideally you'd use two screws (or one screw and a locating pin). If you only use one screw then the flange does help stop rotation. Also, I tend to put a plate on and leave it on - so it gets tightened with an Allen key. That makes for a pretty firm connection.I also use something called Parafilm between the lens and the plate. It's something used in laboratories for sealing glassware (sort of clingfilm on steroids). That greatly increases the friction between lens and plate.</blockquote>