The four-bar linkage and stressed lap had an outstanding result on grinding and polishing axisymmetrical asphere. Its
mechanical structure is succinct and direct, and control is also easy. In "Mathematical analysis about deformation and
movement feature, when using stressed lap to off-axis segment"  (following using MADMF to represent it in this
paper), author put forward two mechanical structures to achieve the axis of lap tilting on both X and Y directions, and
overlap with normal line of off-axis segment's contacting point, both structures have a lower universal coupling and 3
pairs of hoisting joints. Based on adopting four-bar linkage to off-axis segment, now we put forward a new mechanical
structure, and analyze the movement feature. On the other hand, we analyze the movement feature of four-bar linkage,
and remind the attentive matters when using this structure to mirror.