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Well can't comment on the primary except to assume (as you say) that it is centred after all it is new out of the box and one can only hope Sky-Watcher got it right. I checked the spider vain lengths and they appear equal so hopefully that is that.
I must say though that the very small amount of play around the collimator where it fits into the 2" to 1.25" adaptor (and probably the the adaptor to focuser as well) does not make this a precise science.
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