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Thanks for the replies so far. The main technical difference seems to be pushing vs pulling, which for me is no big deal.
I will be mounted on a permanent pier.
I note no-one has comments on the practical performance difference between the Gemini motors, and the standard steppers.
My anticipated costs are about AUD$4k for the G-11, and $1.5k for the Gemini, or $1K for the AN.
Thanks Brian.
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