A new rear brake rod spring fly nut (wing nut) for Norton, cast stainless, short. The thread is 5/16 in cycle (CEI, BSCY). Radius on face for use against trunnion. Overall length: 1-1/2 in (38mm); length of boss: 5/8 in (16mm); Width: 1-5/8 in (41mm) Original Part Numbers: 3443; A2/505 - rear brake adjuster (original brake rod thread was 9/32 in BSCy)