Yup, you're dang right, it changes with EPS, cameras, anything. Hence the dec bearings surfaces are critical. It is a matter of 'stickion'. Enough friction allow some weight differences but slippery enough to not inhibit easy movement of the scope to the next target. Always going to be a compromise. I am using Box strapping, the plastic ribbon strapping you find around warehouse goods. Some people add springs or bungee cords to increase the pressure between the surfaces.
Most of my EPs are reasonably close and once I have added the nights accessories, finder, camer etc then I balance it with additional weight etc and we're away.
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