knots in vedic literature (Brahmagranti-naaga-paasha)

[venkat veeraraghavan]

Dear Vidvans,

Namaste.

There are mentions of various knots like the brahma granti (which i assume is used in making pavitras) and naaga pasha in literature.

Are there references in literature to the actual process of making these knots?

Many Thanks,

Regards,

V