“…Engineering experiences suggest that flexibility of bodies, elasticity of bearings, assembly stresses, thermal loads, joint clearances as well as geometric imperfections (in [24], it was shown that, in the case of redundantly constrained mechanisms, the rigid body assumption must be accompanied by a postulate that links are geometrically perfect) should be taken into account, when solving for realistic reactions. In many models, elasticity of bodies is considered, however, some effects associated with constraint redundancy are still observed, even when mechanisms are modeled as entirely flexible systems, e.g., [1,21]. Quite often, in a multibody model, only selected rigid bodies are replaced by their deformable substitutes, e.g., [37], which not always leads to correct results.…”