1956 Chevy 3100: I have searched high and low for the shaft keeper for this master cylinder. I thought I was being diligent in bagging and labeling everything I had removed, but this keeper has gone missing. What type of keeper slides into the groove on one side but is rounded (no groove) on the opposite side of this brake pedal shaft? Tried to find it in LMC but no luck. Would a regular hardware store like ACE have it?
