This is a Losi Micro Servo Hold Down which I designed for the stock 3 or 5 wire servo. This is available for purchase if you would like to get your hands on one. You can purchase the servo hold down by visiting http://www.shapeways.com/model/563087/servo-mount-losi-micro-stock-servo.html
Note, this is the beta version and may require slight modification. Let me know what you think.
