Piece of 3/4 x 1/8 flatbar in a vice bent to a 90 deg angle, drill 3/8 hole for tailhousing bolt to go through. done, simple clean. I've done alot of these. usually I'll service the trans or be servicing it when I notice the leak but I did my own without pulling the pan about 2 years before I rebuilt it. For all intents and purpose, yours will be just fine now, but that rod looks a bit bulky. At least it won't leak anymore though, feels good to solve that problem.