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That was my initial idea with this, but I only had a 5v electro mechanical relay, and the spring was strong enough that even with the high speed pwm pulse that would drive the motor on the servo, the relay would click open and closed every time the motor power pulsed on and off. Did you use a solid state relay or some additional circuitry to hold energy in the coil to hold it open even when the motor driver power was off in the servo?
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