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I did a similar thing to john using aluminium strip but just to reduce the gap rather than to become a bearing surface.
Left as standard, the gso altitude hubs can move side to side something of the order of 10mm, placing stress on the altitude encoder mount.
That pointing error seems a bit high, I typically get 0.2-0.6 error on either axis depending where I am pointing, but then I dont have the option of aligning to anything other than the stars in the alignment database on palmDSC.
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