"The hooks of the pillars"
Rabbi Yitzchak speaks here about the forms of the supernal pillars, Netzach and Hod, and the hooks from which are suspended the pillars below. The two pillars are united and watered, we are told, by the spinal column, Tiferet, that stands over them. Lastly, we learn that the hooks (vavim) are six within six, so that there are Vav's above in Chesed, Gvurah and Tiferet and Vav's below in Netzach, Hod and Yesod.
Essentially, this passage speaks of how Light flows. Tiferet is the upper Central Column, and Yesod is the lower Central Column residing between Netzach and Hod. This is the critical channel that needs to be opened for us to receive the Light. The Zohar now opens up Netzach and Hod, through the unifying power of Yesod, so that an abundance of Light floods our world, opening up the hearts of man to the true Creator.
925. "The hooks of the pillars and their joints shall be of silver" (Shemot 27:10). Rabbi Yitzchak said, "The hooks of the pillars:" I say all these that are joined with the forms of the supernal pillars, WHICH ARE NETZACH AND HOD, are called 'the hooks of the pillars.' All those of below are suspended from these hooks. What are hooks (Heb. vavim)? They are six within six, BECAUSE VAVIM (VAV'S) ARE TWO TIMES SIX (=VAV), FOR THE SIX EXTREMITIES ARE COMBINED OF EACH OTHER AND EACH ONE HAS SIX. THEREFORE, NETZACH IS SIX AND HOD IS SIX. They are united and watered by the spinal column, WHICH IS TIFERET that stands over them, FOR TIFERET STANDS OVER NETZACH AND HOD. In Safra De'tzniuta (Eng. 'the hidden book'), we learned that there are Vav's above, IN CHESED, GVURAH AND TIFERET, and Vav's below, IN NETZACH, HOD AND YESOD. They all are interpreted in the same way, MEANING THAT THERE IS NO DISPUTE HERE.
925. וָוֵי הָעַמּוּדִים וַחֲשֻׁקֵיהֶם כָּסֶף. רַבִּי יִצְחָק אָמַר, וָוֵי הָעַמּוּדִים, הָא אֲמֵינָא כָּל אִינּוּן דְּמִתְאַחֲדָן מִקִּטְרֵי קַיָּימִין עִלָּאִין, אִקְרוּן וָוֵי הָעַמּוּדִים. וְכָל אִינּוּן דִּלְתַתָּא, תַּלְיָין מֵאִינּוּן וָוִים. מַאי וָוִים. שִׁתָא בְּגוֹ שִׁתָא, וּמִתְאַחֲדָן וּמִתְשַׁקְיָין מִחוּטָא דְּשִׁדְרָה, דְּקָאֵים עָלַיְיהוּ. וּבְסִפְרָא דִּצְנִיעוּתָא תָּאנָא, וָוִים לְעֵילָּא, וָוִים לְתַתָּא, וְכֻלְּהוּ בְּמַתְקְלָא חַד סַלְּקִין.