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To verify the actual length of the GPS tripod center pole:
Pick a good level concrete floor, mark an x and set up the GPS tripod. Make sure the legs don't slip by either chipping the concrete or use a #5610 tripod stabilizer. Confirm and adjust the circular vial if necessary.
Place a straightedge across the top flat surface of the brass rotating stud.
With an accurate pocket tape measure from the floor to the bottom of the straight edge. Keeping the tape plumb, measure at three places and average. This assumes that the floor is level enough not to cause a sizeable error.
The following can alter the length of the center pole:
Worn point. New point length is 3.375".
The Surloc on the center pole can loosen due to use and cause the pole length to be longer. Be careful when extending the section that the impact does not knock the Surloc loose when you come to the stop. A 5/32 allen wrench fits the Surloc mount screw.
In older models that have black lock handle to prevent the rotation of the center pole, the center pole tube is pressed into the head bearing and can come out. Unscrew the black lock and visually look to determine if the painted tubing is flush with the brass housing. This causes the length to be longer.
SurLoc is patented and trademarked by SECO Manufacturing.
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