I have just picked up an O/U Barrel that was tuned and ported by Tom Seitz with the choke tube bottom barrel. It's the old style top thread type 1 tube that requires a wrench that has a round cut out Knurled to fit over the top on the choke tube. I have new style Perazzi wrenches, flush tubes and even extended but nothing to fit these tubes. If you have an old style wrench sitting around doing nothing please PM me and I'm sure it will work out for both of us... Thanks and Keep Smiling, spring is on it's way, I HOPE!!! Don