I have been using a cresent wrench for years with no problems. Have 2 of them, one has tapered jaws for the tapered ones like Colerain, & one is std. for the straight one like Rice makes. Grind them both off short so they don't go over the tangs edges.
I have only seen one wrench made for them, and it would only do one size & for the small barrels it was too sloopy or went up over the tang edge & that is a problem. With a cresent wrench you can adjust it to keep it off the top of the tang.