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I have the 12" GSO dob from Andrews. It definitely has the dual speed focuser. On the Andrews website it clearly states that the focuser includes the 10:1 (ie dual speed) focuser.
These scopes are exactly the same as the Zhumell ones that are sold in the US
I think I would tread very carefully as if any probs with the Zhumell you may be on your own!
Malcolm
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