I leak tested this setup by removing the timing covers, timing belt, tensioner, and idler, then reinstalling the radiator. I poured water in the radiator, and shortly after, it would begin trickling out from below the water pump. Along the bottom perimeter of the pump was dry when I touched it with my hand, and the wetness definitely began a little lower, but I couldn't get at a good enough angle to see it. In order to view the area better, I took the water pump off. The problem with the pump off is that I can no longer test for the leak, since water will just come pouring out the openings instead. All I know is that it was this general area in question, and I wanted to know if anyone has ever had this problem or even knew what this little circular plug looking thing is. I can try putting the water pump back on and have someone hold a phone down there to record the area while I pour water back in. Either way, if its that plug thing, how do you remove it or reseal it? I am just trying to get a game plan for it if that's the case.