Input: pink pulley.
Orange curve is intersection of yellow hemisphere and cylinder (inner surfaces).
Hemisphere diameter: D1 = 100. Cylinder diameter D2 = 30. Their offset: E = 25
Length of green bar of two spherical joints: 0.5 D1.
Axis of cylinder D2 and rotary axis of blue crank are in line.
Vertical axis of the hemisphere and vertical axis of the upper spherical joint (fixed) are in line.
Distance between center of the upper spherical joint and center of yellow hemisphere is L.
Distance between the point of blue bar and center of its spherical joint is L.
Distance from the point of blue bar to its rotary axis is 0,5 D2.
Distance from center of spherical joint of blue bar to its rotary axis is 0,5 D2.