Mounting screws fit the grooved side of the rail but if you want to mount a second phone holder on top of the monitor mount you will be dissatisfied as the screws do not go up enough from the bottom to secure the mount To secure it on the rail as there is no groove on the underside, the bolt has a tapered part that allows it to enter the rail, but because of this taper it doesn't leave it on the flat side far enough to make contact with to make the threads on the other side support says send us a picture. Well I have to ask why can't you pick it up and see for yourself as it's you telling me I'm wrong and that it will fit and as for support they do a great job with you once a day So forget about timely problem solving, I'll send this expensive junk back and get a plastic mount, at least ones with enough cold shoe mounts for my mic and second holder I wouldn't recommend at all
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