It was an aeromotive and the vacuum fitting end('s threads) protruded too far beyond the wall of the housing, so he ended up having to shave it back (the fitting). I believe it was more of a freak occurence though, but I ended up doing the same to mine, just to be on the safe side...
Best bet is to PM him though, so you could get what happened or what he did straight from him...This was a few years ago I talked to him about it and unfortunately, nothing is saved here beyond a couple years ago, for the most part. He may chime in though, as calling out his name is akin to lighting the bat signal it seems (say it three times in the mirror for best effect tho) /ubbthreads/images/graemlins/grin.gif