MTS Criterion Series 40 - Manual (Page 117)

Mount the Grips
A wide range of grips are available. The procedure that follows shows typical grip installation.
Warning :
Grips are heavy.
Dropping the grip could cause injury or equipment damage.
Be sure to support the grip when working with the grip pin.
1. Mount the load frame adapter.
MTS Criterion ™ Series 40 | 117
Best Practices for Other System Configurations and Tests