Hi all, I just picked up some cheap ball lock kegs and I'm in the middle of refurbishing them. I've done this a few times before so I have an idea of what I am doing, but by no means am I an expert. I'm having an issue with a very slow leak from the liquid side post of one of the kegs. There appears to be some pitting/corrosion at the top of the threading and I think that may be where the leak is coming from. I'm attaching a photo I just took. Do anyone know of an easy way to remedy this? Also, is this common at all or did I just get a bad keg?