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Hi Jim,
I have an 8" GSO RC. From bitter experience, I feel obliged to caution you about attempting to collimate it unless you really know what you're doing. They are far more difficult to collimate than a newtonian, for example, and you really need to proceed with caution.
Before I got out my set of Allen Keys, I would investigate all other possible causes of elongated stars starting with alignment, tracking and guiding and focus.
Peter
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