CEM25p conterweight shaft length?

[picclock]

I've ordered one of these on the assumption it would do as in the adverts - balance a load up to 12kgs. However reading the manual it says the purchase of an extension bar is needed for loads more than 6kgs.

If I can know the length of the original shaft, I can make a bar to the correct full length prior to the mount arriving, or at least get the 20mm stock.

So if anyone has one of these a quick measure up would be very much appreciated 🥳.

Best Regards

picclock