Last night, I watched a video that I haven't seen for a while.
It was by another teacher and wise one whom I hold in very high regard. His name is Christopher "Hareesh" Wallis who is a disciple of Swami Muktananda of Ganeshpuri.
I will share it here:
https://m.youtube.com/watch?v=Zwzt9XtSq5Q&t=19s
This video follows on from Igor Kufayev's video about "Ascent of Shakti vs Descent of Grace".
In the above video, Christopher Wallis describes how there are two "Kundalinis" one rising, the other descending...as per the teachings of Swami Kshemaraja of the Kaula school of Tantric Shaktism.
Each of these energies, meet and merge within the Heart Centre
Christopher also gives detailed instructions on breathing techniques to bring the ascending vs descending energies into Shushumna, as well as all of the Shakti "beeja mantras" required to break the psychic knot of Rudra (Maya) Granthi.
You are not going to find this anywhere else online, so enjoy.