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Thanks Fahim for those links. I went through some of the articles and decided to give the meshing another go. I allowed a bit more backlash and used a feeler gauge to allow equivalent spacing on both end of the block. Fundamental B (76 sec error) is almost gone (.26 arc sec) and recorded PE is < 1.5 arc sec over 10 cycle @ 800mm FL. Probably I can fine tune it further but I think for my focal length this should be good enough.
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