The imbalance required is in my opinion proportional to the load on the mount. With my setup it's such that if I am rotating the RA axis counterweights to the east, when I let the counterweight shaft go during rotation it comes to a smooth but decisive stop, if I give it an equal flick in the other direction it maintains momentum. That is with just 5kgs or less of gear. More gear on the mount, less imbalance is how I normally go.
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