Sarvesam (=ghantargatadinam) yantranam iti sarvayantra, tesam atma (=svarupam) eva atmika= sarvayantratmika
She who is the essence of all the yantras ( i.e., mystic diagrams)
Yantras here stand for ghanta argala, etc.
The reason I decided to embark on this journey of understanding the meaning of the Lalita Sahasranama was to enable me the catch the nuances of what each word meant. I bought this book written by LM Joshi which I am using besides I write about my experience or my feelings on that day