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Gripper Variance
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Quite simply, grippers vary. Ten different grippers of the exact same spring diameter from a single manufacturer will have ten different strengths. This variance is significant, resulting in gripper models providing a range of difficulties, rather than a single consistent resistance.
Two #2 grippers. The right one is much harder.
It is not unusual for one gripper to be ten percent harder than another gripper of the exact same model. Differences in the tightness of the spring coil, spread of the gripper handles, and depth with which the spring is set all influence how hard a gripper will be. Further complicating matters, variations in the batch of spring steel and cooling process used also impact the gripper strength.
