In Saraswati Tantra, I came across three things: The Kulukka (कुल्लुका), setu (सेतू) and Mahasetu. Although the tantra says that these are body parts of Japa, the tantra does not address much on what these really are. The Tantra does provide Kulukka of various mantras of many deities. For e.g. The Kulukka of All Taramantras is beej of Nila-sarswati.
Very few sites mention these mantra suggesting that it's not practiced today or practiced but kept secret.
1. What is setu, Mahasetu and Kulukka exactly, which tantra will provide more info on it?
2. Are these three similar to the beej, shakti and keelkam?
NOTE: Sarswati tantra is not about Godesses Sarswati. It presents the order in which the Matrika are taken up from one chakra to the next. The name sarswati is because she is the upward moving kudalini (The Urdhavamukhi Rupa of Kulkundlini)