Rare term for the small ridge on the shamisen neck that supports the second and third strings; also called 上駒 (うわごま).
See also: 上駒
The nut of a shamisen is a small part that supports the second and third strings.
Compound of 触り (sawari, 'touch' or 'contact') and 金 (kane, 'metal'), referring to the metal piece that the strings touch.