If you do decide to replace the servo in your egg, be careful at a model shop!
A standard model servo is no good as they are designed to travel at most, 180 degrees. What you need is a continuous rotation servo, but again beware as they aren't powered by a simple on/off signal, but by a pulse modulated signal sent every 20ms or so, lasting between 0.5 - 2.5ms in length.
As an electronics engineer, my advice is save the disappointment and spend a little extra for a new loader...