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My setup is similar to Alex, 6" reflector on an EQ5 with home made 80mm guide scope. I used it for the first 12 months with the dual axis drives fitted and got quite acceptable tracking over a couple of minutes+ with careful polar alignment. Recently fitted the Goto Upgrade and starting to get longer exposures with autoguiding. I'm pretty sure the newer EQ5's have bearings on the worm drive shafts and not the older bushes which makes them a bit smoother for manual guiding. The grease in mine was a bit tacky, although didn't seem overly heavy, but I changed it anyway.
Cheers
Bill
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