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With regards to the secondary question on electric focuser. JMI make a push on job that goes over the fine focus knob (the smaller of the two). However the fixing for the GSO style of 10:1 focuser is not good as it is based on double sided stick tape and a separate piece of metal. It works but I am still working on mine to make it more solid. Also they are rather expensive for what you get. But in terms of getting rid of the wobbles they are great. You will never go back to using fingers on knobs again five minutes after trying an electric focuser.
Before you look into buying anything to add onto a ficuser look at how much backlash your current focuser has as this will effect how far you can go in fine tuning your focusing particularly if you are imaging, where focusing becomes many times more critical.
Roger
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