I am sorry but I cannot remember having any "2 points per probe" problem when I tested the probe and scanned the quarter.
Bertho

Sorry for the dumb question but, I have been looking over these pages and just do not understand the actual function of the ball bearings and the rod,
can someone please explain, thanks in advance.

A rod touching two balls forms an electrical contact from one ball to the other.  The same is true for the other two rods.   
If the probe tip is pushed, one or more rods will lift and the electrical contact will be broken.

Thanks !