OK, I just got it. This translates the linear movement of the pushrod into rotation and the weight rotates around an offset axis that has an identical moment to the flap. The up and down was confusing me without seeing the flap. Is the flaperon horn or horns conventional, as in non skewed actuation?
I will use this in the future for a bunch of things. Sort of like a lot of the little universal joints in a lot of landing gear legs to rotate the leg while retracting. You can never have a large enough library of solutions available.