One joint balance insertion piece of the mechanism with a driving is used to that connector balance to be made to be disclosed during a joint surgery. There includes one first plate, one second plate and an actuator in joint balance insertion piece. Second plate includes an integrated mounting portion, is used to install the cutting block for the surgical cut that be used to guide the connector during joint surgery. The various configurations that integrated mounting portion may be implemented in insertion piece are thought to be provided for tibial cut, femoral cut and the different types of cutting block of distal end stock installation, such as cutting block.
