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I have the 88mm GSO focuser for my AOE 80mm f7.5 guidescope.
It replaced the very crappy stock R+P that came with the scope. It is way better but not excellent. Having only used a GSO newt crayford for comparison (which I thought was very good for the money) - the refractor focusser drawtube can slip under the influence of gravity unless tightly locked.And careful when locking as this will move the assembly moving your guidestar - not perfect!! Didn't need regreasing, but mechanically a tight fit to get it onto the scope!!
I would certainly go for the WO or similar(not GSO) on your imaging scope.
All the best
Doug
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