I just bought 2 more kegs on eBay and the out posts have an odd star shaped pattern. My other kegs, and the inputs on these, have normal bolt style 6 sided posts that I can get off with a wrench. I can't get these posts off to save my life. I see online they sell sockets with this shape, but I'd rather skip the shipping and go get one at home depot. Anyone know what size I would need to get the post off?