Hi Chris,
Just a quick question, is your mount belt modified ? I use the same mount with 11.5kg on it and get between 0.5 and 0.7 arc second error with the very occasional bump that might degrade a couple of images in a session. The other thing you can try is to tighten the backlash in the worm drives. Really easy to do but you have to be careful not to go too far. Sorry if this is a Segway from you asking about string balance weight. Please ignore if you’ve tackled both of these suggestions.
Cheers
Ryan
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