Ball valve?

Today I changed jets in my Holley vac secondary 4V carburetor. I removed the front float bowl and the front metering plate, set it power valve down on my bench and changed the jets down 2 sizes. When I picked up the metering plate I saw a small steel ball about 3/32 in diameter laying there. I absolutely could not see where it came from and all my research did not show there should have been one on the power valve side of the metering plate. I am flummoxed about what to do. Anyone have any insight?
TIA------------------------------------------DR-----:-)