The strings are attached by the veena-making artist. Seven metal strings are tied at the end of the resonator to a metallic clasp using metal rings. This helps the musician for accurate tuning. Brass and steel strings are then tied to these seven rings. Four strings pass upon the bridge among which two strings will be of brass and two of steel. Three strings pass over the curve bar adjacent to the bridge. The four main strings ascend into and are attached to the four pegs (Birugai), in the peg box, which is at the end of the veena neck. The other three strings are attached to the knobs (kauji) on the sides the neck.
Mixture of beeswax, candle wax, benzoin resin and charcoal powder is melted and prepared into dough. This dough is rolled and fixed on the finger board as a base for the brass metal frets. 24 brass frets are attached to the finger board. Finished Veena’s are painted with varnish to give an elegant look.
For more details: http://dsource.in/resource/saraswathi-veena-making