I think my C11 is only about 11Kg...must check.
Yes, there's a great big iron counterweight ring mounted in the inside of the mirror cell. This was required to bring the balance point of the OTA back to the dec axis. I have some photos somewhere.
Not an easy job to remove!!
I found the 12" Lx OTA unstable on a NEQ6...sold it and went for the lighter C11.
EDIT: It weighs 12Kg
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