man, i was looking for that tool yesterday...but i needed it as an "exhaust pipe flare expander"
never did find mine, but i ended up being able to pound a second flare into the first flare to expand it farther
(some dummy had cut the pipe to close to the bend, so i had to reweld it, but then i didnt bother dressing the weld properly and so i needed to open the flare in order for it to slide over the weld)