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This counterweight weighs in at 2.5 kg (or 5.5 lbs) and is tailored for several iOptron mounts, including:
If you've got a CEM40, double-check the diameter of your counterweight (CW) shaft to make sure it's 28mm before you place an order.
Oh, and by the way, you can also use this counterweight with other mounts that have a 28mm diameter CW shaft.
Actual dimension, except inner diameter, may be different.