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A Sequential Quadratic Programming technique was utilized to synthesize optimal performance of a spring-loaded four-bar mechanism that, when actuated, lifts a farm tillage implement out of the soil. Maximum lift and magnitude of actuation force were significantly improved over a current design. Computer-aided design was used to confirm that interference design constraints were not violated during optimization. In-field performance of the mechanism when encountering an obstacle was verified using a dynamic model to realistically simulate the event. This paper presents efforts to improve performance of a spring-loaded four-bar mechanism through the application of computer-aided design techniques. When actuated, the mechanism allows a seeding and fertilizing implement to pivot out of the soil to avoid damage by some obstacle.