Left C or F Correction Key Adjusting Screw
This is a short adjusting screw with a nylon bumper that is typically used for the connection to the left F/C key on modern Buffet Bb and A Clarinets. It is also used for the F correction key on instruments that include this key. Additionally Divine Bb and A clarinets use this screw for the throat A/G# adjustment.
M3x4