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I have an RC8 but I believe the bolts are the same. From what I've read I think the larger silver ones are push screws and the smaller black ones are pull screws.
In my experience, in practise the load is on the pull screw/s in the direction of gravity and on the push screw/s above so the unloaded screws act as lock screws.
I got Bobs knobs for mine but I find I can't be as precise as with an allen key, especially when my hands are cold, so I've removed them and added a wrist strap (rubber band) to my allen key so I don't drop it on the mirror.
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