Guralp Systems CMG-3TB - Manual (Page 39)

Operator's guide
9. Wind the cable onto the winch by rotating the handle. Ensure
that the cable builds up neatly across the drum. Continue
winding until the loop on the other end is as high as you need it
to install the equipment.
If the ratchet prevents you from winding the cable on, twist the
metal boss in the
DOWN direction to free the cable.
10.Remove the handle, and screw it onto the metal spool of the
ratchet mechanism.
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