With the introduction of the ND172 (double dummy), it was no longer necessary to mount the ND170 back to back with the N523-105 threaded rod to create a double dummy. Therefore, the N523-105 was discontinued.
The ND170 surface mount screws were changed in May 2019. The new surface screws allowed for the ND170 to be surface mounted back to back without the need for the N523-105 threaded rod.
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