I filled the transmission of my (non-overdrive) MGB a couple of weeks ago, (took two quarts) and I couldn't help noticing that the drain plug in the gearbox is surrounded by blue silicone. Now I know enough to realise that this is not a good sign. I am not getting serious leaking, so it's not a serious problem right now, but I was wondering what I can expect to find. Is it easy to strip the thread in the gearbox casing, or is it more likely that the doofus had lost the washer and was just too lazy to order another one?