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Thanks for your careful guidance. Purely by luck, I already have a 5 x 4.5 mm flexible coupling so I will be spared that part of the process. I find I have a box full of various sizes of couplings left over from days long ago when I was messing about with DIY Arduino focuser control projects.
I am still waiting for Bintel to get my ZWO EAF into stock. It’s been a slow process.
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