BSA Chain Adjuster Bolt + Nut A7/A10 Plunger /Set
66-4603*2.27-4401*2/SetBSA Chain Adjuster Bolt A7/A10 Plunger
BSA M20, M21, M33, 1937-1939 Rigid Frame
incl. WM20
also fits Plunger B31, B32, B33, B34
Chain Tensioner
Rigid BSA M-Group 1937-57
Also for WD Models