I think we might be bumping into a wall at this point, figuratively speaking of course :)
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you mention you¡¯ve tried with two different HCs and boxes. It is extremely improbable that both boxes suffer from the same issues so this points to some, hopefully easy to fix, user error. Since you¡¯ve tried everything that has been suggested I think the best option going forward would be for you to take pictures, or even better videos, of your HC settings and the steps you¡¯re taking to have the mount move. You know what they say, a picture is worth 1000 words, and a video a 1000 pictures :)
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hopefully with that we¡¯ll have a better idea of what¡¯s going on and offer better suggestions
