Trombone Linkage Connecting Rod Threaded Ball - old style
Threaded stainless steel ball for use with connecting rod (item 017431, sold separately) on all old-style ball and socket Bach trombone rotary valve linkages. For all model 36B, 42B, 45B and 50B single valve, traditional wrap instruments. Ball measures 6.3 mm (1/4 inch) in diameter.