need help wont shift into third

idk it was leaking out alot of fluid. I did some photo search's online and something popped into my head that gave me an idea of what might be happening to the converter. every photo of converters I look at are the same but yet on the converter I have it has a spot on there on the bolt side a hole drilled with a square bolt plugging it but every photo I find doesnt. so im thinking the guy who I first bought my stuff from did that to it to drain it. so Im thinking fersure it the converter.