If you want to hydro it, call your local fire extinguisher places. Fire extinguishers have to go through hydro, too, and they're all over the place. In fact, around here, all the dive shops send the tanks to the same place for hydros, and you can too.
Of course, that doesn't get around the fact that you'll need an LDS-style VIP sticker for them to fill it, and if it's that old and aluminum, you'll need the eddy current test (technically, that rule doesn't go into effect until January 1, 2007, but it's a de facto rule now).
If you go into the dive shop waving the new regulation (not yet in effect) and showing a good hydro, visual, and eddy current test, you can feel justifiably upset when they refuse to fill it anyway.
Of course, that doesn't get around the fact that you'll need an LDS-style VIP sticker for them to fill it, and if it's that old and aluminum, you'll need the eddy current test (technically, that rule doesn't go into effect until January 1, 2007, but it's a de facto rule now).
If you go into the dive shop waving the new regulation (not yet in effect) and showing a good hydro, visual, and eddy current test, you can feel justifiably upset when they refuse to fill it anyway.