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Chart of the periodic error of the EQ- 6 mount.  Not exactly sure how to interpret it. .

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Chart of the periodic error of the EQ- 6 mount with my attempt at priodic error correction.  Each line is 8 minutes (1 worm revolution) at 2 frames per second.   The big dips are dropped frames during capture and should be ignored.  The pink line (2nd 8 minute run) has a pe of only 11 arcseconds.  The blue and teal are 12 arcseconds.  The yellow is 18 arcseconds.  The high frequency pe is consistently around 2 arcseconds.  The subject was Betelgeuse at a declination of 7*24'.  I'll try another run soon.  Perhaps stacking barlows will allow easier detection of the drift. 

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