This is a dust cap that fits on the push rod bar at the bridge between the clutch hosing and primary drive. Its purpose is to stop grit and dirt entering the housing and allows the rod to keep lubricated and moving freely.
BSA BANTAM Clutch Pushrod Dust Cap D7
BSA C15 B25 B40 B44 B50 CLUTCH PUSHROD
BSA Bantam Kickstart Lever Small Spline Fixed BSA Bantam D1/D3/D5/D7/D10/D14
BSA Bantam silver BSA Bantam supreme D10 replacement parts catalogue 1967 #
BSA D1 D3 D5 D7 D10 D14 Bantam clutch plates
BSA BANTAM D1 D3 D5 D7 D10 D14 B175 CLUTCH PLATE PLAIN 90-0037 UK MADE