I realize I'm beating a dead thread here, but I came across it when trying to figure out where to drill the hole for a weldless bulkhead for use with the Sabco universal siphon and pre-drilled false bottom. I was concerned that it wouldn't work, but I tried it, and I was able to get the siphon perfectly centered using a weldless bulkhead kit from weldlessfittings.com. Instead of using the included close nipple, I used the threaded portion of the siphon. Also, I put the locknut on the inside of the keg to space the siphon properly. I haven't used it yet, but I put it together this weekend and tested it for leaks, and it seems good.