Instructions:
(a) Remove one factory knob from either side of unit.
(b) Turn key clockwise and remove from lock.
(c) Screw GPS/Sounder lock into female thread until tight.
(d) Insert key and turn counter clockwise.
(e) Knob will spin freely when locked correctly making it impossible to remove..
Note: Lubricate often and record key number for replacement keys when lost.

Northstar
GD011 (M6 x 1.00 Male Thread)	952 958