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I think it is coming off the baffle tube. When you pull the telescope apart and see the reflection of a bright light off the baffle tube I am quite convinced this is the cause.
I haven't seen the extension tubes that attach between the visual back and the focuser but they are big enough diameter that I don't think they come into play.
The fact that the reflections appear when a star is just off the edge of the field indicates that the baffle tube is almost doing its job.
The baffle tube needs that nice fine machined rigde that eats reflections.
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