IRB1200 Joints

Have an IRB 1200 - its End Of Arm Tooling has couple servo units that MUST be used with the robot at a stationary pose. Its not extended but still a certain pressure the EOAT has to exert causes the robot to move - this is undesirable - is there a way, at the pose only,  I could stiffen the Joint servos to fight this deflection? 

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