Tirumandiram

https://www.himalayanacademy.com/media/books/tirumantiram/web/Invocation.html 

I did not find it here but often mentioned are 'Nandi' s feet' on the head of disciple. This seems a description of God being felt at the crown chakra. I felt it in this way today, pressurevequally on both halves of head and pushing energy through body downwards in this pattern. I like having scriptures confirmed by experience.