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Geoff,
Try shimming the sides of the base with teflon pads to take up the sideways movement with the altitude hubs. I actually had to do this with my 10" to get Argo Navis to align more accurately. I shimmed each side with 2 pads of 3mm teflon which improved the pointing accuracy of Argo Navis to the stage where it is now close to perfect. This flexes the sidepanels of the base out a little putting them under mild load and stops the OTA moving sideways in any direction. It also improved damping times immensely. I will go out and see if I can get a digicam pic and post it.
Clear Skies
John Bambury
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