I have a side by side setup on my EQ6: C11 and ED80.
Its not too difficult to achieve good balance especially if you know where the balance point is for each of your scopes individually. If you do, front to back balance will be close when they are mounted in the clamps at that location and you'll only need to do a little bit of fine tuning front to back (RA axis level and scopes level).
Rotate to RA axis level and scopes vertical to check your side to side balance.
Once you've got it right, it shouldn't matter what direction the scopes point when the RA axis is level, it should balance. If it doesn't, but your side to side balance is good, then you must have one scope forward and one back of their balance points (balancing each other front to back). Move it to scope at 45° from horizontal (maximum imbalance if you are close to balanced side to side and front to back) and the direction of imbalance will suggest which way you have to move the scopes.
Al.
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