55 Ford 640 Carb Question

Just noticed a missing screw / bolt on the bottom of my carb? I have not had to do any adjustments to the carb since inheriting from my father. Not sure what the part is or how to locate it. The carb has a larger drain plug at the bottom of the bowl, a small brass screw head on the front of the bowl and then the opening just to the rear of the drain plug but more centered in the bottom of the bowl? Anyone have this screw / bolt or know the specifics of what size it is , etc. or where I can purchase such? Checked local dealer and nothing available as a replacement part.... Not sure if this would be included in a rebuild kit .

Welcome to the site!

Can you post a picture so we can get a better idea of what your asking about?

Yes, I have a photo of the carb with the missing screw / part. But, being new to this forum and I have been searching around as to how to post the photo?

Well, I tried adding as an attachment and here it is!

Ford 640 Carb photo

well here is the side view of the carb.