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optical tube assembly i think
the springs have a piece of material that is attached to the bottom of the spring, you pull this down with one hand and over the bottom support.
the spring is easy enough to attach and reattach, but strong enough to hold my camera assembly or 2" eyepiece when pointing at the horizon.
honestly, i do not see it as a determining factor. i wil even take a video of it tonight and post it
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