I am also having trouble seeing where it is leaking from. I don’t see a “black dot that appears shiny” and I don’t recall any “vent hole” in that area. But assuming your cork is OK it is very likely that the float valve is dirty causing the float chamber to overflow from the top and run down the side of the float chamber and drip from the bottom of the carb. It is routine to clean out the float valve because dirt and old varnish will accumulate in that area causing the tapered bottom of the float needle not to seat properly, but it is rarely if ever necessary to tap the taper against the seat with a hammer and I don’t recommend it. You can spin the taper with a small diameter pencil eraser to assure it seats well. If you like you can call me and I will explain how to do it. 231-929-7479.
