I've had no problems with flexure using this with the ed80. And that is the scope that Petra will be using.
There is no balance problems using such a wee guide scope, though if it was attached to a great whopping losmandy bar, I could see such trouble arising.
This set up allows you to get away with using just one counter weight too!!!
Note how the leads are secured neatly to the base so as not cause any drag on the on the back of the camera.