Guralp Systems CMG-3TB - Manual (Page 27)

Operator's guide
2. If applicable, you should test the hole lock mechanism before
installing the sensor. For safety reasons, the hole lock is
normally supplied with the arm extended.
To test the mechanism, connect the signal cable to a breakout
box and Holelock Control Unit, and attempt to retract the hole
lock arm (see Section 2.6, page 22.) If this fails, you should
contact Güralp Systems. Extend the arm once more.
3. Fix the main lifting cable to the shackle on top of the strain
relief mechanism, and run the signal cable through the
mechanism using the built-in clamps (without tightening them.)
Do not allow the signal cable to bear any of the sensor's weight.
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