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Regarding run out on the dec shaft measurements. I normally see at least .4 mm runout some are even more. I have also seen some as little as .1mm. The extension pieces I made are quite true and have accurate faces to mate with the Dec shaft. However the dec shafts themselves are usually the culprits. That is why you need to spend so much time determining the runout before you calculate the mean level. The older LX200 classics seemed to have less runout than the newer GPS models which use ballraces.
Barry
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