Well I got the barrel put together and filled, now I just have to make sure they figure it out. I don't have the greatest yet but it's been unseasonably warm so I should be fine until I get to town and pick one up. The nipples threaded in just fine with a 3/8 hole drilled. The biggest problem is getting the hole nice and straight, if not the nipples end up sort of crooked but they still seem to seal alright
A 1/8" pipe thread tap or a metric M10-1.0 tapered tap work wonders with the nipples using an 11/32" or 9mm drill bit...