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I can say one thing about this. I also have a 12" gso scope . I use the tension springs along with 7 1/2 LBS of counterweights at the back end (underneath the tube,opposite the focuser and other heavy stuff,finderscope& telrad), plus I have just the bolt and a locking nut that reaches it with space to spare on the bolt and mine doesn't come loose no matter which way I turn it. I find that the tension springs work excellent when I switch from light to heavy eyepieces, and I also put magic supersliders in between the round pieces of wood on my dob mount. I then use a small amount of vasoline on the magic sliders to add just the right amount of "glide" when I turn the mount in azimuth.
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mark
12" gso scope
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