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Its a 8mm fitting. On my Genesis, when I removed the focusser knob I found the shaft was a tapered fit!! from about 10mm down to 8mm, so it would not fit!! Ended up making a small length of 8mm shaft and screwed it into the end of the pinion shaft then fixing the drive unit; also need a small extension plate to match the screws in the focusser housing. Such is life.
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