What is exactly the additional length of built-in extenstion compared to vkb or virpil base? From th

What is exactly the additional length of built-in extenstion compared to vkb or virpil base? From the dimensions it looks like it is 160mm from the axis of rotation, and in my vkb it looks like i am only 40mm from the axis rotation (my guess, it might be more), hence I was assuming that you have defacto a 120mm extension built in. Has someone measure this more accuretely?
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