Hi again Dean.
One caution about the larger scopes is that going from 80 to 90mm may be too much piggyback load, as it will likely add 2kg or so plus extra counterweight, plus it is pushed out further from the centre of mass. As long as you balance it all carefully before setting the clutch, and further reduce your maximum slew rate, you could probably get away with it, but it may exceed the manufacturer's recommended weight as well as increase guiding and vibration induced errors.
Regards,
Eric
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