Hi Niall, I have a similar scope and mount to yours, and what I have done to balance it, is mount the finder on the opposite side of the scope to the focuser. My guidescope, also a reflector is mounted directly on top of my main scope in away that its focuser is also on the oposite side to the main focuser. In this way the front end of my scope is almost balanced from leftbto right, (main camera on one side, finder and guide camera on the other). All that needs to be done then is slide the entire scope assembly further back to find the centre of gravity so it is also balanced front to back. Hope that gives you some ideas that may help. What i do for alignment etc is ensure my finder is exactly aligned to my main camera. That way when i do my three star alignment or lign up on my object, i simply use the finder. Once pointed at my object i do a 10 second test shot to confirm my object is framed as i want, then check focus, guiding calibration, and start taking images. Once again hope that helps you out with some ideas.
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