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Lee,
I had a search around SGL last night to see if anyone else has been complaining about the Avalon Linear. All I saw was lots of praise and very flat guide graphs usually around 0.25 arcsec RMS guide error. The only person that had a complaint (Olly Penrice), who believed they suffer a bit when tracking in the wind (belts stretching).
As the mount is designed to be guided only and if it does a good job doing that, unguided PE graphs are just a distraction to make you worry.
Cheers
Bill
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