Sonny - I have the same mount and had trouble with the USB hub that iOptron supplies. I tried some cabling through the mount as well and now I've just gone to putting the RPi and a Pegasus Astro Ultimate PowerBox on a plate attached to my optical tube. I should probably run the power cable for the Pegasus PowerBox and the ethernet cable to the RPi through the mount but those two cables haven't degraded my guiding so I haven't been motivated . . . . yet. In the meantime, the setup allows me to use very short cables for everything else.

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